Dismissing New Posts

I may just be stupid, but how do I re-enable seeing the New posts? It says I can in preferences but not sure where or how. Now that I’ve clicked Dismiss New Posts I can’t see them anymore?

they’re not new anymore. You have to go to latest and it will likely be there if it was recent - Forum

The thing you’re probably thinking about is the number of days your profile counts as recent.
That’s in your profile, top right icon.
Then click on the icon for the person/head
then click on preferences
then click on notifications
Then change settings for “Consider topics new when…”

play with that setting for what you want.