I have some custom CSS that puts a box around each category, but even with this disabled, the X or close button in the top right corner of chat windows does not show up. Edit: Looks like it only does it with the Flatly theme. If I go into my settings on this site and select Flatly, it does it here as well.
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@soulz2003 as you probably noticed. The behavior is that a user automatically gets a notification if he makes the topic. Additional users can follow the topic by pressing the follow button(the eye icon)