I am a regular ps user and would love to try the new program but the interface would be a killer on my eyes. is there a setting?
In what way would it be a killer on your eyes? I was a PS user too and think PSE is amazing.
There is no provision to customize the UI color theme in Photoshop Elements 2020. The only part of the UI that can be changed is the canvas area. Right-click anywhere on it to bring up the color choice dialog. Please refer to https://community.adobe.com/t5/Photoshop-Elements/How-to-change-the-Worspace-Background-color/m-p/10...
Just bought the Elements package, 2020 edition, and was surprised to see there was no dark theme support in the Organizer, my previous version (11) had this which I liked a lot. Is there any way to fix this with some tweak?
You can change Photoshop 2021 to dark or lighter mode by using: SHIFT + F1