you can set that in the admin panel and it will apply to all styles.
however, "hide my online status" simply means that their name will not show up as being online when they are online. they can still post etc. their name will just not show up at the bottom of the page and they will not have a online banner in the profile at the right of the posts.
this has nothing to do with anything but the name showing up on the pages.
I'm baaaaaccckkkk. still doing work on donation basis. PM your needs.
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If a tree falls in the forest and nobody is there, does it make a sound?