Hi Zooen, that's the intentionally designed behavior that if you open a tab which would cause the side pane to become longer than the available vertical space that it will collapse tabs at the bottom up until there is enough space to fit it without a scroll bar.

The script SeparateSidePanePalettesNotViewSelect.js is making that situation worse by ungrouping all tabs.

What happens if you just remove SeparateSidePanePalettesNotViewSelect.js and let the UI work as it is supposed to?

- Michael