It seems Liftoff does not yet support Lemmy read status. There’s also no settings to hide read topics.
However I found that if I read a topic using Jerboa (with read posts will be hidden afterwards), it will be hidden on Liftoff. While reading any topics on Liftoff won’t hide it when viewing from Jerboa.
Yeah this would be amazing to have in the future, so I wouldn’t see the same content all the time.