Hello, thank you for the feedback! Are you referring to the popup window that appears if Pixelorama crashes and you open it again to load the saved back-ups? This window can already be dragged by the user, if the mouse is on its top, where it says "Please Confirm". Alternatively, you can press OK (or Enter) to load the backups and close Pixelorama normally. The backups will no longer appear. If you don't want to do that, you can use the arrow keys to navigate between the OK and the Delete button. When the message appears, press the right arrow button to select the Delete button and then hit Enter.
We will take a look at the issue and fix is so this no longer happens!