Resizing of Columns in "File Status" is Broken

When clicking on the "File Status" of my repository, I configured my Sourcetree to show "Pending Files, Sorted By Path", in a "Flat List with Multiple Columns" and "Split View Staging".

The view has three columns: The left most one is the grey workspace pane, incl. the branches, remotes, etc. The second one are the two fields for staged and unstaged files. The third one is the diff window.

When I now try to resize the different columns to my needs, the other two columns get automatically resized as well and this resizing does not work for me at all. I can make the column with the un-/staged files a maximum of maybe 300px in width, before the other columns magically gain width as well, making the column that I actually want to increase (the file one) effectively smaller. This is super annoying.

This behavior has emerged very recently and, unfortunately, breaks Sourcetrees staging and diff functionality for me. I am switching to the terminal for now and hope that this gets resolved as soon as possible.