Not saving minor changes with KDE Plasma in VirtualBox VM

[winterbrise]

As total Noob I wanted to try out Manjaro, KDE Plasma, in a VM on my Mac.
But it doesn’t even save the changes with the theme (dark theme), my wallpaper and also the welcome screen, Manjaro Hello, still launches although I toggled of “Launch at start”. Wether I boot again or restart.
And those are just a few examples.
Infos here:

System:
 Kernel: 5.13.19-2-MANJARO x86_64 bits: 64 compiler: gcc v: 11.1.0
 parameters: BOOT_IMAGE=/boot/vmlinuz-x86_64 lang=en_US keytable=us tz=UTC
 misobasedir=manjaro misolabel=MANJARO_KDE_2114 quiet systemd.show_status=1
 apparmor=1 security=apparmor driver=free nouveau.modeset=1 i915.modeset=1
 radeon.modeset=1
 Desktop: KDE Plasma 5.22.5 tk: Qt 5.15.2 wm: kwin_x11 vt: 1 dm: SDDM
 Distro: Manjaro Linux base: Arch Linux
Machine:
 Type: Virtualbox System: innotek product: VirtualBox v: 1.2 serial: <filter>
 Chassis: Oracle Corporation type: 1 serial: <filter>
 Mobo: Oracle model: VirtualBox v: 1.2 serial: <filter> BIOS: innotek
 v: VirtualBox date: 12/01/2006

How can I ensure to get a smooth Manjaro testing experience?

[bogdancovaciu]

You still have the ISO connected to the virtual CD/DVD and you are booting from it, not from the installed system, if you did the install …

[winterbrise]

Ok. So I checked that quickly through internet search.

That means I would have to configure a “raw hard disk access” as VirtualBox calls it, if I wanted Manjaro to boot from an installed system(?). But that, as it says, should only be done by experts. Or advanced users.

So one option then would be to bear it and do all my changes and testings/workings in one session?

[Nachlese]

No.
You install your system,
then you shut it down,
then you remove the installation medium - the ISO from which you just installed.
Else the VM will keep booting from that same ISO and never the system that you just installed.
Just as with a real PC - take the CD out of the drive or tell it to boot from the drive you installed to.

Change the boot order if you don’t want to remove the ISO.
You still need to shut it down to do that - not just reboot …

[winterbrise]

Lol, I’m happy that the third (actually fourth) word in my very first post was “Noob”.

Thank you.