Unable to set shortcut keys and default bright mode in the help library

Things I have tried

I searched help in help docs but couldn’t find anything

What I’m trying to do

My help library defaults to dark mode and I want to set the bright mode to the default. But I failed. After setting bright mode, I turned off the help library and then switched it back to dark mode.

I want to change the light and shade mode in the help library with the set shortcut keys, but the shortcut keys set in the help library cannot be saved. The shortcut keys are reset once the help library is closed and then opened.

Who can help me? Thank you very much