If you have a tab undocked so it is floating and right click it->hide tab, you will be unable to unhide it. I think the orange triangle is being blocked by the Unreal button.

Steps to Reproduce

1. Undock a tab
2. Right click the tab header and hide the tab
3. Try to click on the orange triangle to unhide it

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Won't Fix
ComponentTools - Slate
CreatedNov 5, 2014
ResolvedMay 1, 2017
UpdatedMay 1, 2017