For the first part, you’ll need to change the ‘profile’ language file. Follow the instructions in the bottom section here and change the ‘user_x’ value from 'User ^' to just '^'
For the second part - unfortunately there’s nothing you can do. That part is not in your title and Google decided to add the overall site name in there. You can’t get them to change it.
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April 20, 2021: Q2A 1.8.6 released!