Not sure if this is an error with my resolution or what kind of bug this is but I'm unable to close out of the aptechka config menu without first reloading my entire UI.

There is no close dialog option, or an x dialog option to get out of this modal without reloading my UI or exiting and restarting my game.

You can actually click the top right corner, but the X doesn't display

You're right, I'm able to click in the top right to close it, odd bug. Thanks for the fix.