- If you don't allow the users to set themselves to invisible mode, then no, they can't go change it (the options won't be there in the User CP). However, if some users are currently set to invisible mode when you took the option away, they will be stuck in invisible mode.
- No, you can't force them to put a reason. (Maybe there is a modification, I don't know, you can try a search)
- vboptions > forum listings display > show lock to users > no
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