problem with light baking

hi guys, i’m actually trying do some training in unreal with bp but i had encounter some trouble with light, in particular with baked light, like in the video( Desktop 2021 02 22 14 27 54 02 - YouTube ) unreal take 4-5 seconds to show me the real illumination of a light and do this thing even with baked so how can i fix this? i haven’t anything setted on true in the post process options and actually i don’t know where to see to fix this problem

thank you!

Turn off auto exposure in the project settings.