Actually, I would place the “Subscribed” button as another layer, or remove it completely since it might only make sense to filter subscribed communities… (does it?)
Also I would add a “New filter” option to the menu.
I understand this change would need a great deal of work to be implemented since to create a filter one would have to have access to several filtering options: add one or several communities to search in, add keywords (or hashtags - but, please, see @mark@programming.dev’s answer) to include, maybe certain users…
Would it be realistic to implement some kind of language like: “keyword -unwanted AND (keyword OR keyword) AND community:!comunity@instance AND user:@user@instance …”?
Well… I thought of listing all posts related to technology (for example) grouping Linux, free software, open source… there are many communities dedicated to each of those. It would be useful to group them together for quick access.
I intentionally used a different font to give emphasis to changes. Also didn’t want to try and fail to mach the used font.
Maybe bookmarking the post and remembering to get back there later as a workaround?..