I have been using impress for a bit and just ran into this problem today. I was making slides for a presentation and when I went to reorder them instead of being able to drag and drop them when I attempted to move them I got a plus sign in a circle and it just duplicated them. When I tried to use the keyboard shortcut (alt-shift-pageup) nothing happened. I tried to restart the program and the same issue happened. Restarted the computer, same issue. New presentation, same issue. I am using windows 11 and am on version 25.2.
Any help will be appreciated