My buttons have stopped working on my MX Master 3. How do I unpair or uninstall because I cannot work without the buttons?!

This happened after I signed up for the Beta test of Options+

Please inform the community that this Options+ has this problem to prevent others from having the same problems as I did.

Please reply to me the steps to overcome this issue. Otherwise I will have to post on websites and forums to try and get some other help from others who are like me