Unable to move notes into side panels as before

I can no longer move files/view into the side panels as before. If I try to move a note view into the side panels on the left, the right one got highlighted as the notes get squashed and squeezed on the right side as an extra panel.

Probably had a bit too much fun with css snippets last weekend. How can I fix it to get it work like before?

Thanks in advance!

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