The gradebook columns are way too wide, since they very inefficiently display the descriptions on one line. You can drag the column to be narrower, however:
The text does not move to the left, continuing to waste space.
The assignment name just gets cut off, rather than wrapping down a line, Allow 2 or 3 lines for this information to fit...no need to force it onto one line
Optionally use vertical text when setting narrow columns, much more efficient, as done here:
https://www.idoceo.net/index.php/en/?option=com_content&view=article&id=258
See how the text changes as the width is adjusted. Can Canvas do this?