I'm not a coder but am getting to know Firestore Database. As you can see, we have posts set up to automatically geotag based on the users present location. Only other users in a 5km sphere from the posting user will receive the post in their timeline.
My question is, through Firestore Database, is it possible to make a post non-geo specific? I would like to alter an existing post, or make a new post that all users of the app will receive, irrespective of their location.
Thanks in advance for any help!

If you want to get database results that don't consider the geographic location, you can use the regular Firestore query API to do so.
Only when your query (or add-on library) includes a filter on the geohash field will the query be specific to the geo-location.