Look and feel packages with layouts defined (like the maui one, see: https://github.com/maui-artwork/artwork-lookandfeel-maui/tree/master ) seem to restore the layout partly (at least the used desktop containment) on every start. 
So custom user settings like the switch to Desktop Containment instead of Folder View containment and wallpaper are reset everytime. 
Though the default plasma wallpaper is used instead of the one defined in the layouts file in the look and feel package

Reproducible: Always

Steps to Reproduce:
1. Install Maui Look and Feel and set as default, relogin
2. Change from Folder View containment to Desktop Containment and set a different wallpaper
3. relogin

Actual Results:  
Resets back to Folder View desktop containment with default plasma wallpaper

Expected Results:  
Should stay and Desktop Containment with selected wallpaper