Is it possible to remove the Composer Column from the Adjust Tag window in the left part of this window?
It messes up my view and you almost need a ultra wide screen and frequent adjustments in this column ?
Yes, it is possible in theory.
You need to open the websource script used (saved in the configuration folder of Mp3tag) in a text editor.
Search for the "Composer" column code lines and disable or remove them.
Save a copy of this modified script and use this modified websource script.
I don't think it's worth the effort of carrying out the manual modifications and the necessary tests when you can simply reduce the width of this column by dragging the right border of the column to the left.