@Jistme: That's truth
@Ma_t14: For main panel i disable "Preferences\layout\automatically fit displayed columns". Anyway this same request could stablish a permanent width for a field being in main panel or being in track browser.
Actually my complete wish which i didn't write for complexity was the columns in track browser working very similar than in main panel, being able to be moved and resized. Track browser filtering only works from left to right, so for conveniency sometimes i would like to drag and drop a column to the left for a easier filtering. For example if you want to know what artists do you have with songs in 1980-1989 rated with 4-5 stars, showing the results easily in the last artist column.
EDIT: Anyone feel free to discuss about columns here, being in track browser or not.