The Circle Select status-line hints are cryptic and incomplete. This is a speed bump/papercut for new users.
PROBLEM
“Subtract” and “Add” is a terrible way to say “Size Brush Smaller/Larger”;
I don’t even know what “MsPan” means;
RMB isn’t listed as an option to Escape;
and Middle MB isn’t even listed.
SOLUTION
Simple text editing to include all the functions of the Circle Select tool