Allow player to set brightness?

Hey all!

Is there any way to have the player set the brightness at the start of the game (like a lot of games do) so that it affects all levels equally?
I have tried adding a PostProcess volume to the player character and having a slider in a widget adjust the manual Exposure or Gamma, and that makes my darker nighttime levels look good but my brighter daylight levels get way too overexposed.

I realize I could make the setting only affect the darker levels, but it seems like i should be able to make this work like i planned and affect the whole game.

Any help would be awesome!

I’ve added slider which changes scale value from 0 to 1, and this code to change Gamma. Not sure if this is the proper way, but it works in my game.