Hi there,
Out of date mainly appears for phone templates and clients. It is to indicate that a new version of a phone template or client is available.
You would like to know when a new 3cx client is available for example?
If you are not interested then do not expand the respective tabs of the updates that do not interest you.
You can also upvote the post mentioned in reply from Sopock so that feature may be implemented in a future release.