can't open or view xlsx files (mac)

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Hello lovlies!

First off grateful for Libreoffice! I have been a user for about a year and a half! It was working for me super well but then I was having issues opening any file. I deleted the original download & downloaded the newest version (2020-03-23) ... and it was working!

BUT only with MSWord files ... all of my xlsx files won't open & when I try to open them by opening the spreadsheet, it won't even list the excel files as options to open ...

Please help!!! As a Mac user I absolutely HATE numbers/pages/etc. & want my happy awesome Libreoffice back!!!

:) jenn