I am afraid you cannot disable that on the profile field, we overrode the renderer, I am not sure if it is possibel to prevent that with a setting.
For info that change was not made for teachers, it was made for students to try and encourage them to add to their profile, but it is an additional click to "login as" and access other information.
The issue with block headers has already been fixed in the our latest version on GIT, we will have to put another update out shortly to remedy that here on Moodle.Org, for now you can try this version:
https://gitlab.com/3bits/moodle-theme_adaptable2/-/archive/master/moodle-theme_adaptable2-master.zip