Cant move animation boxes in animator and work with them

Hello. Need help. I cant move my anamation boxes in animator and work with them, give them transitions and other. Cant add new transitions and so on. I tried in different projects and in older ones, nothing. I Have unity 2020.1.0a24.[156660-безымянныи.png|156660]

Installed previous version and problem was solved. So I think it was alfa issue.