App is terrible with iMac

I have been using the paid version of Last Pass on my PC for several years, without any problems.
I just installed it on my IMAC, and it is non functioning. It is easier for me to switch to my pc laptop when I have to go online.
If I switch full time to IMAC, I probably will not renew.
In fact, there should be a credit issued to the Mac users, until the app works at the same level as on the PC.

Bruce B 2 about LastPass Password Manager