Beta program information is posted here on the forum, although if you are new to the app, I would not recommend jumping on the beta.
I’m not sure the feature @sylumer refers to is what you are asking for either. I think you are asking how to create a workspace that filters for the tag “family” rather than searching for the word “family” in the text. That is simply done by using the “Tag Filter” field on the Workspace, not the search query field. Info on usage in the docs.