Details follow.
1. Menu “Tools” – Plug-ins – HTMLbar”: HTMLbar displays on toolbar.
2. Menu “Tools” – Plug-ins – HTMLbar”: HTMLbar disappears as expected.
Now do exactly the same with FindBar. FindBar remains visible on toolbar even after deselecting plugin (step #2 above). You have to disable it from the toolbar context menu too to remove it.
PS: Using EmEditor 10.1.1 x64 (Win7 Pro x64)
Thanks!