Some areas of the UI are not finally yet, especial the Main Inventory we wanna rework.
And i will take your Feedback for a Update in consideration, and you are right, the Windows should close, i guess it will give a much better user experience.
The Escape Button i think im with u as well, i was wondering and curious already, if its okay if the "Pause Menu" gets up even other Panels are open or not.
Thanks for your Feedback, really appreciate.