I would swear we used to be able to change the width of the folder pane by clicking and dragging. Is that no longer to be the case?
That should still be possible. I just shot this video on CLZ Comics Web, using Chrome:
Is this not working for you? What do you see? (feel free to post a screenshot or video if you like)
This is what i get using Opera and Chrome.
Seems I fixed it. Changing the layout from No Details to Vertical Split and back to No Details got it working again.
Then again, I think I found the actual bug. After I do the fix above and then switch between views (List vs Vertical Cards), it locks the left panel again. Seems the adjustability goes away between views.
Good to hear you got it working.
When switching between vertical/horizontal or cards/list on my side it seems to keep working for me (I can still drag the slider). I am on Chrome though.
I would like to investigate a bit further if possible. Can you let me know which browser you have?
And perhaps it would help if I can see the problem happening… You can record your screen via this website:
You can send me the file(s) via:
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Using Chrome. Same thing in Opera.
Hm indeed, I can reproduce that now as well 
thanks for showing me, I’ll pass it along here so we can fix that!