this sounds like a feature request that should be opened in lemmy-ui issue tracker.
this post was submitted on 11 Jun 2023
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GitHub would probably be the best place for feature requests.
That said the feature you're talking about is already (sorta) available. You can head over to your settings and disable "Show read posts" which will hide posts you either A) opened or B) up- downvoted.
I recently contributed a mark post as read button to the lemmy-ui which will hopefully be merged & released soon-ish.