Thought you meant you didn’t want to keep seeing read posts on your feed. If it serves of any consolation you can turn the setting on/off so read posts show up again, also you can save posts, so you can see them on your profile’s saved section, even if they don’t show up on your regular feed anymore.
That’s a good tip, but only half the solution. An account wide flag is the nuclear option, but granular control by post is important in conjunction.
Thought you meant you didn’t want to keep seeing read posts on your feed. If it serves of any consolation you can turn the setting on/off so read posts show up again, also you can save posts, so you can see them on your profile’s saved section, even if they don’t show up on your regular feed anymore.