In my settings collab deactivated and deleted in package manager. All worked fine (last 2020.1.0b1), but after upgrade to 2020.1.0b5 there is problem. Some times if we make changes in files or scripts and back to Unity Editor, Checking for changes window appears and marks all our files like new to collab, and .collabignore file is created. You have to pull the switch on and off collab in the settings again, so that it turns off. But after a while this repeats.