I am not seeing the same behavior. The Alt+Up is already used for Align Top. If you select more than one shape, then execute this hotkey, the shapes should move to be aligned to the top of each shape. Is that not happening for you?
Show us what is or is not happening on your end using screenshots or video (host video on YouTube or other service, make public and share the link here).
No, unfortunately the standard function for ALT+UP does not work and I have to reset the hotkeys every time I open Ligthburn. These are apparently not saved either. I have already deleted the hotkey file.
I’ve asked @JohnJohn to test on his systems as well. It looks like it has something to do with the German translated version, at a minimum. We will generate a report for the translation team to review. Works as expected in English. Thank you for drawing our attention to this issue.