So I have a combo box with different window mode options
And I created method on change for that combo box but I can’t figure out how to choose an option from it and set fullscreen mode to be the one that player chose
Would appreciate every advice 
With your setup you could use a Switch on String node:
If you just have started with your settings, you may want to check out Mathew Wadsteins approach to that. Works great and is easily adjustable.
Unreal Concepts - Blueprint Only Video Settings Menu ( UE4 ) - YouTube
Yep that’s exactly what I was looking for. Thank you so much for the help and for the useful link as well! 
No it won’t work like this at least in my case
