In the task pane LibreOffice underlines a character in multiple button texts. For example "Add..." in custom animation has the A underlined. That signals that the user can press alt+A to run that command. But alt+A doesn't do anything. In fact, none of those alt+___ commands does anything.
Either remove the underlined text or make the alt shortcuts functional.
The Version field of this bug is unspecified. I can confirm that this issue
exists in LO Version 220.127.116.11. However, this issue has been fixed in LO Version: 18.104.22.168. So...I'm changing the status to RESOLVED-FIXED.
I tested using WIN 8.