KDE Lock screen not centered in open source driver

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I have two monitor. One laptop 1366720, external 1600900. Now my problem is if I set proprietary driver. Everything is okay. But if I set open source driver laptop login screen is not centered. it is mirroring 1600*900. So, it’s not centered. Is there any fix for this?

IMG_20210524_234434
IMG_20210524_2344342304×1728 338 KB 

System:    Kernel: 5.10.36-2-MANJARO x86_64 bits: 64 compiler: gcc v: 10.2.0 
           Desktop: KDE Plasma 5.21.5 Distro: Manjaro Linux base: Arch Linux 
Machine:   Type: Laptop System: ASUSTeK product: X550JK v: 1.0 serial: <filter> 
           Mobo: ASUSTeK model: X550JK v: 1.0 serial: <filter> UEFI: American Megatrends 
           v: X550JK.304 date: 04/16/2019 
Battery:   ID-1: BAT0 charge: 9.5 Wh (100.0%) condition: 9.5/32.6 Wh (29.2%) volts: 14.8 
           min: 14.8 model: ASUSTeK X550A30 status: Not charging 
CPU:       Info: Dual Core model: Intel Core i5-4200H bits: 64 type: MT MCP arch: Haswell 
           rev: 3 cache: L2: 3 MiB 
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 22359 
           Speed: 3293 MHz min/max: 800/3400 MHz Core speeds (MHz): 1: 3293 2: 3292 3: 3294 
           4: 3292 
Graphics:  Device-1: Intel 4th Gen Core Processor Integrated Graphics vendor: ASUSTeK 
           driver: i915 v: kernel bus-ID: 00:02.0 
           Device-2: NVIDIA GM107M [GeForce GTX 850M] vendor: ASUSTeK driver: nouveau 
           v: kernel bus-ID: 01:00.0 
           Device-3: Realtek USB Camera type: USB driver: uvcvideo bus-ID: 1-7:5 
           Display: x11 server: X.Org 1.20.11 driver: loaded: intel,nouveau 
           unloaded: modesetting resolution: 1: 1366x768~60Hz 2: 1600x900~60Hz 
           OpenGL: renderer: Mesa DRI Intel HD Graphics 4600 (HSW GT2) v: 4.5 Mesa 21.0.3 
           direct render: Yes 
Audio:     Device-1: Intel Xeon E3-1200 v3/4th Gen Core Processor HD Audio 
           driver: snd_hda_intel v: kernel bus-ID: 00:03.0 
           Device-2: Intel 8 Series/C220 Series High Definition Audio vendor: ASUSTeK 
           driver: snd_hda_intel v: kernel bus-ID: 00:1b.0 
           Sound Server-1: ALSA v: k5.10.36-2-MANJARO running: yes 
           Sound Server-2: JACK v: 0.125.0 running: no 
           Sound Server-3: PulseAudio v: 14.2 running: yes 
           Sound Server-4: PipeWire v: 0.3.28 running: no 
Network:   Device-1: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter 
           vendor: AzureWave driver: ath9k v: kernel port: e000 bus-ID: 03:00.0 
           IF: wlp3s0 state: down mac: <filter> 
           Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet vendor: ASUSTeK 
           driver: r8169 v: kernel port: d000 bus-ID: 04:00.1 
           IF: enp4s0f1 state: up speed: 100 Mbps duplex: full mac: <filter> 
Bluetooth: Device-1: IMC Networks type: USB driver: btusb v: 0.8 bus-ID: 1-5:6 
           Report: rfkill ID: hci0 rfk-id: 1 state: up address: see --recommends 
Drives:    Local Storage: total: 1.02 TiB used: 47.43 GiB (4.5%) 
           ID-1: /dev/sda vendor: Western Digital model: WDS120G2G0A-00JH30 size: 111.8 GiB 
           ID-2: /dev/sdb vendor: Seagate model: ST1000LM024 HN-M101MBB size: 931.51 GiB 
Partition: ID-1: / size: 109.19 GiB used: 9.24 GiB (8.5%) fs: ext4 dev: /dev/sda2 
           ID-2: /boot/efi size: 299.4 MiB used: 296 KiB (0.1%) fs: vfat dev: /dev/sda1 
Swap:      ID-1: swap-1 type: file size: 512 MiB used: 0 KiB (0.0%) file: /swapfile 
Sensors:   System Temperatures: cpu: 94.0 C mobo: N/A gpu: nouveau temp: 63.0 C 
           Fan Speeds (RPM): cpu: 4500 
Info:      Processes: 190 Uptime: 8m Memory: 7.66 GiB used: 2.56 GiB (33.5%) Init: systemd 
           Compilers: gcc: N/A Packages: 1188 Shell: Bash v: 5.1.8 inxi: 3.3.04
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