sort icon no longer responds

The sort icon at the top of my libreoffice calculator document no longer responds.
Secondly, the top line (above the icon) with words, such as File, Format has disappeared.
Any ideas?

EDIT: Hi Ebot

I use Windows 10 Not sure what LO means. The only way I can get the icons to work and the top line of words (“File”, “Edit” etc) to come back is to go into safe mode. This has happened before, but I can’t find the answer on the internete anymore. Cheers Marty

Which OS- and LO-Version do you use?

LO = LibreOffice