How do I resize the left sidebar when the bar won't slide?

Question

At some point last week, I tried to resize the sidebar to see more of the menu items and it resized to half the page, unintentionally.  Now when I try to resize it to be narrower, I get the curser to show the double arrows but it won't slide/move.

I seem to be unable to attach a screenshot here.

eelliott_rz1dd3 · Answer

Apparently the same issue is happening for others on my team.

eelliott_rz1dd3 · Answer

Just tried Chrome and when I went to slide it left, it went right to half the screen again and I can't resize it.

eelliott_rz1dd3 · Answer

I'm using Edge.  I haven't tried Chrome but will try.  I deleted the cookies because initially I was missing the sign in icon as well.  Once I deleted the cookies, that reappeared but still can't move the sidebar column.