Can't resize switches column

Problem:

I'm unable to resize the switches column. To be more accurate, I'm able to resize it, but the minimum width lets a lot of space on the right side.

The problem occures only with this one. The other columns don't have any empty space (marked red in the image)

What I tried:

Hovering over the intersection between two timeline columns at the top of the timeline, the mouse cursor changes to a double-ended arrow, I drag to the left until the column width doesn't change any further.

Resetting the preferences and uninstalling (with deletion of the preferences)/reinstalling of After Effects.

Expected result:

Being able to reduce the size of the column to the first switch on the right side, so that there is not this much free space.

I don't want to get rid of the switches entirely, just of the free space next to them.