SUMMARY
When using multiple monitors with my Optimus enabled laptop (Using the NVIDIA GPU to drive the external displays with PRIME), the internal laptop display no longer has a wallpaper, the option to right-click on it for a menu, or any desktop icons. But i can still drag windows to it and view them on there perfectly fine

STEPS TO REPRODUCE
1. Enable NVIDIA mode with Optimus manager / set NVIDIA GPU as primary
2. Plug in external monitor(s)
3. Set plugged in monitor as a primary display
4. Reboot Laptop

OBSERVED RESULT
Laptop display no longer has wallpaper or any right-click menu


EXPECTED RESULT
Laptop display should still function as a desktop display

SOFTWARE/OS VERSIONS
Linux: Arch Linux (kernel 5.8.10-arch1) 
KDE Plasma Version: 5.19.90
KDE Frameworks Version: 5.74.0
Qt Version: 5.15.1

ADDITIONAL INFORMATION
Laptop being used here is a Razer blade 2018. It has a GTX 1060 which drives the DP and HDMI external outputs. The laptops own display is driven by the intel IGPU