UI issues with UE 4.26 main menu

After some twiking of UI pannels (moving around and enabling small icons) I have end up in UE File Edit … menu blinking and rendering in wrong positions (can’t access menu items at all). Tried to close all panels. Still an issue. Screenshots in attachments.
Not sure how to reset UE editor UI settings.
Can provide file for reproduce but not sure where it is)

Fixed upon creation of new project.
Old project still has blinking menu rendering beetween correct and wrong possition. Unusable.