KDE Plasma scaled too big with dual-screen setup

Hi there!

I just finished a fresh installation of Manjaro/KDE on my computer. I am using two screens, both are plugged in via the graphics card, one via DVI the other one via HDMI.

When I start the PC with both screens plugged in, the desktop environment is scaled too big. It’s not bigger than the actual screen and both screens are recognized, but every icon and window related to Plasma is huge. If I start an application like firefox, everything within firefox is scaled normal.

If the PC starts with just one screen plugged in, the scale is normal, even if I then plug in the second screen afterwards.
What do I have to do to get the PC to start with both screens scaled right?

I used the same setup previously and everything worked fine, now after the fresh install it seems to be messed up and I can´t find a fix.

(The scale was huge, when I used the USB live-version too.)

Kernel: 5.10.93-1
Graphics driver: video-nvidia
Graphics card: GTX 970

Thanks in advance!

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This is my output for inxi:

inxi --admin --verbosity=7 --filter --width                                                                                       ✔ 
System:
  Kernel: 5.10.93-1-MANJARO x86_64 bits: 64 compiler: gcc v: 11.1.0
    parameters: BOOT_IMAGE=/boot/vmlinuz-5.10-x86_64
    root=UUID=7faeb08f-af2c-4a51-8634-b4a54fb3df32 rw quiet apparmor=1
    security=apparmor resume=UUID=c2f1a4ab-a53e-45fa-8bf0-faf32d472c3f
    udev.log_priority=3
  Desktop: KDE Plasma 5.23.5 tk: Qt 5.15.2 wm: kwin_x11 vt: 1 dm: SDDM
    Distro: Manjaro Linux base: Arch Linux
Machine:
  Type: Desktop System: ASUS product: N/A v: N/A serial: <superuser required>
  Mobo: ASUSTeK model: PRIME Z590-V v: Rev 1.xx serial: <superuser required>
    UEFI: American Megatrends v: 1017 date: 07/12/2021
Battery:
  Message: No system battery data found. Is one present?
Memory:
  RAM: total: 15.47 GiB used: 2.02 GiB (13.1%)
  RAM Report:
    permissions: Unable to run dmidecode. Root privileges required.
CPU:
  Info: model: 11th Gen Intel Core i7-11700KF bits: 64 type: MT MCP
    arch: Rocket Lake family: 6 model-id: 0xA7 (167) stepping: 1 microcode: 0x40
  Topology: cpus: 1x cores: 8 tpc: 2 threads: 16 smt: enabled cache:
    L1: 640 KiB desc: d-8x48 KiB; i-8x32 KiB L2: 4 MiB desc: 8x512 KiB
    L3: 16 MiB desc: 1x16 MiB
  Speed (MHz): avg: 3849 high: 4766 min/max: 800/4900:5000 scaling:
    driver: intel_pstate governor: powersave cores: 1: 3661 2: 4766 3: 4635
    4: 4702 5: 3628 6: 4226 7: 4606 8: 3395 9: 3253 10: 4350 11: 4354 12: 2775
    13: 3049 14: 4334 15: 1451 16: 4404 bogomips: 115232
  Flags: 3dnowprefetch abm acpi adx aes aperfmperf apic arat
    arch_capabilities arch_perfmon art avx avx2 avx512_bitalg avx512_vbmi2
    avx512_vnni avx512_vpopcntdq avx512bw avx512cd avx512dq avx512f avx512ifma
    avx512vbmi avx512vl bmi1 bmi2 bts clflush clflushopt cmov constant_tsc
    cpuid cpuid_fault cx16 cx8 de ds_cpl dtes64 dtherm dts epb erms est f16c
    flush_l1d fma fpu fsgsbase fsrm fxsr gfni ht hwp hwp_act_window hwp_epp
    hwp_notify hwp_pkg_req ibpb ibrs ibrs_enhanced ida intel_pt invpcid
    invpcid_single lahf_lm lm mca mce md_clear mmx monitor movbe mpx msr mtrr
    nonstop_tsc nopl nx ospke pae pat pbe pcid pclmulqdq pdcm pdpe1gb pebs pge
    pku pln pni popcnt pse pse36 pts rdpid rdrand rdseed rdtscp rep_good sdbg
    sep sha_ni smap smep ss ssbd sse sse2 sse4_1 sse4_2 ssse3 stibp syscall tm
    tm2 tsc tsc_adjust tsc_deadline_timer tsc_known_freq umip vaes vme
    vpclmulqdq x2apic xgetbv1 xsave xsavec xsaveopt xsaves xtopology xtpr
  Vulnerabilities:
  Type: itlb_multihit status: Not affected
  Type: l1tf status: Not affected
  Type: mds status: Not affected
  Type: meltdown status: Not affected
  Type: spec_store_bypass
    mitigation: Speculative Store Bypass disabled via prctl and seccomp
  Type: spectre_v1
    mitigation: usercopy/swapgs barriers and __user pointer sanitization
  Type: spectre_v2 mitigation: Enhanced IBRS, IBPB: conditional, RSB filling
  Type: srbds status: Not affected
  Type: tsx_async_abort status: Not affected
Graphics:
  Device-1: NVIDIA GM204 [GeForce GTX 970] vendor: Gigabyte driver: nvidia
    v: 495.46 alternate: nouveau,nvidia_drm bus-ID: 01:00.0 chip-ID: 10de:13c2
    class-ID: 0300
  Display: x11 server: X.Org 1.21.1.3 compositor: kwin_x11 driver:
    loaded: nvidia display-ID: :0 screens: 1
  Screen-1: 0 s-res: 3934x1080 s-dpi: 94 s-size: 1063x292mm (41.9x11.5")
    s-diag: 1102mm (43.4")
  Monitor-1: HDMI-0 res: 1920x1080 hz: 60 dpi: 305 size: 160x90mm (6.3x3.5")
    diag: 184mm (7.2")
  Monitor-2: DVI-D-0 res: 1920x1080 hz: 60 dpi: 102
    size: 477x268mm (18.8x10.6") diag: 547mm (21.5")
  Message: Unable to show advanced data. Required tool glxinfo missing.
Audio:
  Device-1: Intel Tiger Lake-H HD Audio vendor: ASUSTeK driver: snd_hda_intel
    v: kernel alternate: snd_sof_pci bus-ID: 00:1f.3 chip-ID: 8086:43c8
    class-ID: 0403
  Device-2: NVIDIA GM204 High Definition Audio vendor: Gigabyte
    driver: snd_hda_intel v: kernel bus-ID: 01:00.1 chip-ID: 10de:0fbb
    class-ID: 0403
  Device-3: Logitech G933 Wireless Headset Dongle type: USB
    driver: hid-generic,snd-usb-audio,usbhid bus-ID: 1-10.1:6 chip-ID: 046d:0a5b
    class-ID: 0300
  Sound Server-1: ALSA v: k5.10.93-1-MANJARO running: yes
  Sound Server-2: JACK v: 0.125.0 running: no
  Sound Server-3: PulseAudio v: 15.0 running: yes
  Sound Server-4: PipeWire v: 0.3.43 running: no
Network:
  Device-1: Intel Ethernet I219-V vendor: ASUSTeK driver: e1000e v: kernel
    port: N/A bus-ID: 00:1f.6 chip-ID: 8086:15fa class-ID: 0200
  IF: eno1 state: up speed: 1000 Mbps duplex: full mac: <filter>
  IP v4: <filter> type: dynamic noprefixroute scope: global
    broadcast: <filter>
  IP v6: <filter> type: dynamic noprefixroute scope: global
  IP v6: <filter> type: dynamic noprefixroute scope: global
  IP v6: <filter> type: noprefixroute scope: link
  WAN IP: <filter>
Bluetooth:
  Message: No bluetooth data found.
Logical:
  Message: No logical block device data found.
RAID:
  Message: No RAID data found.
Drives:
  Local Storage: total: 3.02 TiB used: 15.99 GiB (0.5%)
  SMART Message: Unable to run smartctl. Root privileges required.
  ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Samsung model: SSD 980 500GB
    size: 465.76 GiB block-size: physical: 512 B logical: 512 B speed: 31.6 Gb/s
    lanes: 4 type: SSD serial: <filter> rev: 1B4QFXO7 temp: 31.9 C scheme: GPT
  ID-2: /dev/sda maj-min: 8:0 vendor: Seagate model: ST3320620AS
    size: 298.09 GiB block-size: physical: 512 B logical: 512 B speed: 1.5 Gb/s
    type: N/A serial: <filter> rev: K scheme: MBR
  ID-3: /dev/sdb maj-min: 8:16 vendor: Western Digital
    model: WD20EZRX-00D8PB0 size: 1.82 TiB block-size: physical: 4096 B
    logical: 512 B speed: 6.0 Gb/s type: HDD rpm: 5400 serial: <filter>
    rev: 0A80 scheme: MBR
  ID-4: /dev/sdc maj-min: 8:32 vendor: Samsung model: SSD 850 EVO 500GB
    size: 465.76 GiB block-size: physical: 512 B logical: 512 B speed: 6.0 Gb/s
    type: SSD serial: <filter> rev: 2B6Q scheme: GPT
  Message: No optical or floppy data found.
Partition:
  ID-1: / raw-size: 448.44 GiB size: 440.33 GiB (98.19%)
    used: 15.96 GiB (3.6%) fs: ext4 dev: /dev/nvme0n1p2 maj-min: 259:2
    label: N/A uuid: 7faeb08f-af2c-4a51-8634-b4a54fb3df32
  ID-2: /boot/efi raw-size: 300 MiB size: 299.4 MiB (99.80%)
    used: 25.5 MiB (8.5%) fs: vfat dev: /dev/nvme0n1p1 maj-min: 259:1
    label: NO_LABEL uuid: 2AA2-EB9C
Swap:
  Kernel: swappiness: 60 (default) cache-pressure: 100 (default)
  ID-1: swap-1 type: partition size: 17.02 GiB used: 0 KiB (0.0%)
    priority: -2 dev: /dev/nvme0n1p3 maj-min: 259:3 label: N/A
    uuid: c2f1a4ab-a53e-45fa-8bf0-faf32d472c3f
Unmounted:
  ID-1: /dev/sda1 maj-min: 8:1 size: 298.09 GiB fs: ntfs label: Volume
    uuid: F048F96248F9284C
  ID-2: /dev/sdb1 maj-min: 8:17 size: 1.82 TiB fs: ntfs label: Big Mamma
    uuid: A8A44F08A44ED888
  ID-3: /dev/sdc1 maj-min: 8:33 size: 16 MiB fs: <superuser required>
    label: N/A uuid: N/A
  ID-4: /dev/sdc2 maj-min: 8:34 size: 146.47 GiB fs: ntfs label: N/A
    uuid: 06D401D6D401C93F
  ID-5: /dev/sdc3 maj-min: 8:35 size: 319.28 GiB fs: ntfs label: Steam
    uuid: A022764E22762984
USB:
  Hub-1: 1-0:1 info: Hi-speed hub with single TT ports: 16 rev: 2.0
    speed: 480 Mb/s chip-ID: 1d6b:0002 class-ID: 0900
  Hub-2: 1-3:2 info: VIA Labs VL813 Hub ports: 4 rev: 2.1 speed: 480 Mb/s
    chip-ID: 2109:2813 class-ID: 0900
  Hub-3: 1-3.1:4 info: VIA Labs VL813 Hub ports: 4 rev: 2.1 speed: 480 Mb/s
    chip-ID: 2109:2813 class-ID: 0900
  Hub-4: 1-10:3 info: Genesys Logic Hub ports: 4 rev: 2.0 speed: 480 Mb/s
    power: 100mA chip-ID: 05e3:0608 class-ID: 0900
  Device-1: 1-10.1:6 info: Logitech G933 Wireless Headset Dongle
    type: Audio,HID driver: hid-generic,snd-usb-audio,usbhid interfaces: 4
    rev: 1.1 speed: 12 Mb/s power: 100mA chip-ID: 046d:0a5b class-ID: 0300
  Device-2: 1-11:5 info: Razer USA Cynosa Chroma type: Keyboard,Mouse
    driver: hid-generic,usbhid interfaces: 3 rev: 2.0 speed: 12 Mb/s
    power: 500mA chip-ID: 1532:022a class-ID: 0300
  Device-3: 1-12:7 info: Sunplus Innovation SmartMouse type: Keyboard,Mouse
    driver: hid-generic,usbhid interfaces: 2 rev: 2.0 speed: 12 Mb/s
    power: 100mA chip-ID: 1bcf:0824 class-ID: 0301
  Device-4: 1-13:8 info: ASUSTek AURA LED Controller type: HID
    driver: hid-generic,usbhid interfaces: 2 rev: 2.0 speed: 12 Mb/s power: 16mA
    chip-ID: 0b05:19af class-ID: 0300 serial: <filter>
  Hub-5: 2-0:1 info: Super-speed hub ports: 9 rev: 3.1 speed: 10 Gb/s
    chip-ID: 1d6b:0003 class-ID: 0900
  Hub-6: 2-3:2 info: VIA Labs VL813 Hub ports: 4 rev: 3.0 speed: 5 Gb/s
    chip-ID: 2109:0813 class-ID: 0900
  Hub-7: 2-3.1:3 info: VIA Labs VL813 Hub ports: 4 rev: 3.0 speed: 5 Gb/s
    chip-ID: 2109:0813 class-ID: 0900
Sensors:
  System Temperatures: cpu: 27.8 C mobo: N/A gpu: nvidia temp: 25 C
  Fan Speeds (RPM): N/A gpu: nvidia fan: 46%
Info:
  Processes: 319 Uptime: 3m wakeups: 0 Init: systemd v: 250 tool: systemctl
  Compilers: gcc: 11.1.0 clang: 13.0.0 Packages: pacman: 1220 lib: 333
  flatpak: 0 Shell: Zsh v: 5.8 default: Bash v: 5.1.16 running-in: konsole
  inxi: 3.3.12

This is the output for xrandr:

xrandr                                                                                                                            ✔ 
Screen 0: minimum 8 x 8, current 3934 x 1080, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected 1920x1080+2014+0 (normal left inverted right x axis y axis) 160mm x 90mm
   1920x1080     60.00*+  59.94    50.00    60.05    60.00    50.04  
   1680x1050     59.95  
   1600x1200     60.00  
   1440x900      74.98    59.89  
   1280x1024     75.02    60.02  
   1280x960      60.00  
   1280x800      59.81  
   1280x720      60.00    59.94    50.00  
   1152x864      75.00  
   1024x768      75.03    70.07    60.00  
   800x600       75.00    72.19    60.32    56.25  
   720x576       50.00  
   720x480       59.94  
   640x480       75.00    72.81    59.94  
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DVI-D-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 477mm x 268mm
   1920x1080     60.00*+
   1680x1050     59.95  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1280x960      60.00  
   1280x720      60.00  
   1152x720      60.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   640x480       75.00    59.94