Make sure that you remove only the tag assigned to the person you wish to remove. The file will have a long alphanumeric name, and a single line of text that includes the string "google-site-verification".
The actions and permissions vary depending on the type of association (for example, Chrome Web store). Unlike site owners and users, associates can't open or view your Search Console account or data directly but they are authorized to perform other tasks.
Each of these roles has different rights and capabilities. You can be an owner or user of a property.