I'm not the author of the mod! I just edited the original mod: https://modworkshop.net/mod/19403 by Dr_Newbie

The experience rate has been reduced from 100 to 25 percent (But mission XP returned), the black background in the notification about gaining experience has been removed, the message has been repainted white and shortened

I hope I won't offend the author if I post this. I love his modifications and if he asks I will hide it.

Preview: https://youtu.be/6G1Apz1ROHk