Colors are brighter after exporting in PDF

[DanielsR]

Hi! I'm new to the Illustrator and hopefully, someone can help me to solve my problem. Seems like there are plenty of these situations when the color changes. I tried almost everything, nothing seems to help. 
My issue - when I export .ai file to pdf, colors are brighter. 

I use Adobe Acrobat reader, I have Illustrator 24.1 and I use RGB colors.

[Doug A Roberts · Accepted solution]

If you go to Preferences > Page Display in Acrobat, is Enhance Thin Lines checked?

[DanielsR]

Yes, it's checked

[Doug A Roberts]

Uncheck it.

[DanielsR]

Dude, big thanks!! Just made me happy 😄