Alonezhby,
You should be able to set the fullscreen, or the screen resolution by following information in [this AnswerHub][1]. If you’re not looking to set this up with blueprints, try [this AnswerHub][2].
I have reproduced this issue and logged a report for it here [UE-38704][3]. You can track the report’s status as the issue is reviewed by our development staff. Please be aware that this issue may not be prioritized or fixed soon.
Since a bug was entered on this AnswerHub, could you please submit your mouse issue on a new AnswerHub post so we can keep the issues separated? Please include steps, or screenshots on how you’re exactly testing so that we can make sure we’re testing exactly as you are.
Thanks!
How can i change game's resolution in blueprints - Programming & Scripting - Epic Developer Community Forums
[2]: Setting game resolution for packaged games - Platform & Builds - Epic Developer Community Forums
[3]: Unreal Engine Issues and Bug Tracker (UE-38704)