Disable ability desktop rotation/change
I found even elementary students doing this by using Hotkeys.
To Fix –
log in as sysop/admin or pcadmin so can get to Graphics options, right click on empty part of desktop.
Disable Hotkeys and Rotation
On the GX270 below found the Hotkeys off in Default but you should check to be sure
I found the GX520 had no Hotkeys - below