First every sub need a pinned post that contain a description of the sub and the name of it in the top , the admin of it ,posting fee... All this in a box in the top not like now
perhaps the sidebar could be useful here, and maybe an expandable gear icon on mobile to show these settings… not sure it needs to look like a pinned post
Something like a start page That remember you what this sub is about Because accessing sub is manually in sn
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Also when someone create a new sub that pinned post will appear in the home feed so you know a new sub was added
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