As english is not my first language is a bit complicated to describe the problem itself so I think it should be better to show a couple of images.

https://i.imgur.com/auHRd9i.png
https://i.imgur.com/fCq3Qbv.png

Normally, my desktop should be likes this: https://i.imgur.com/VPCRBWj.jpg

The only think I did was (Btw, my SO is Manjaro):

- Create a new virtual desktop (previously I just had one, I mean one only desktop).
- Enable "switch desktop on edge" and then I was testing the speed at what the desktops moves when I switch between them, so I repeatedly move the mouse over the edges changing between desktops like a crazy ping pong game.
- Then I discovered that having "switch desktop on edge" enabled blocks me for toggle my top panel (that I previously had on auto hide), so I disable the "switch desktop on edge" option.
- Then I restarted and the desktop became the thing you can see on the image.

The problem is only with the desktop and it is only a cosmetic one (although my top panel for some reason is always on top as image 2 shows) because all my system works as usual, I can open firefox, dolphin and other apps and they have their normal appearances sizes and functionality.

I also used timeshift to restore my settings files to 30 mins before but it doesn't fix the issue.

Anyone had this problem before?

Looks to me like a resolution problem - try "arandr" and Outputs>Your Monitor>Resolution then pick something appropriate.

You may need to install arandr as I don't think it's installed by default on most distros:

sudo apt install arandr

I try arandr but in the resolution it shows the correct one (and in the kde settings panel too).

As a side note(this is something I forget to mention in my first post), when I change the resolution from 1920x1080 to a small one and then back to 1080p it fix the issue with the desktop itself but the notifications are still showing in a mmm incorrect way? Let me show you a screenshoot https://i.imgur.com/LAsSk3H.jpg

It looks like the issue is with my user only because when I create and login into a new user all the elements displays as usual.

Well then I'd suggest looking through ~/.local/share or ~/.config to see if these apps have saved config files anywhere.