Searching for Legacy items in Homebrew

how do you search for legacy items/content in homebrew offerings? I had thought that it may be a "tag" filter but have been unsuccessful. 

By "legacy" do you mean content that was designed for the 5e rules?

If so, there isn't really any way to indicate that in the homebrew tool on anything other than a subclass, so there's not really a way to filter on it.

For subclasses, you can use the Class filter to filter to the 5e versions of specific classes.

yes 5e rules. Wow that's really surprising and disappointing.