UE4.14 Mouse vanishing problems in main menu

I have a problem with my mouse vanishing in main menu when I missclick on background if the widget.

My main menu widget. When I press the buttons my mouse dosen’t vanish, but when press anything outside the vertical box, where the buttons are my mouse cursor vaishes and I can’t get it back until I don’t close and then open it again.

Maybe there is other useful info in these pictures.

Please help me out. I’ve looked on other posts but I didn’t really understand the solution here: UMG Mouse Vanishes After Clicking Background - Programming & Scripting - Epic Developer Community Forums

P.S. I’m a noob in UE4.