How to change GUI colors and themes?

I like to work on the beach, and with the bright sun, black background is problematic.

Is there a setting and a way to change that?

I'm looking for a paler theme for the IDE.

Nope sorry no theme changes for coloring are available at this time. Hopefully they will do something like this in a future update. I would suggest posting your request in the Ideas forum so they know you would like that feature and that way others can chime in if they do too.