Hope you are doing well and sorry to hear that.
Is this an issue with a particular PDF file or with all the PDFs? Please try with a different PDF file and check.
Also, make sure you have the recent version 22.1.20169 installed. Go to Help > Check for updates and reboot the computer once.
You may also try to rotate the page orientation as described here https://helpx.adobe.com/acrobat/using/manipulating-deleting-renumbering-pdf-pages.html and see if that works.
Note: Option available with Acrobat Pro DC
Let us know if you experience any trouble and need more help.