@J_D1
You could create a map layer (mbtiles) with the locations shown on the layer - see the image as an example:
(red crosses are one vector layer exported from QGIS with the background mapping included, the red circle is the ODK data point stored for this instance). There are instructions in the Docs section about using offline maps (mapbox) and layers...
This works really well to navigate to the right location and SHOULD also work with the feature of showing a map with existing data points on your phone (to avoid duplication) - I'm just about to post a support question with a problem I have with this, so your question was (almost) relevant, but I think you're looking for something else perhaps as a default location?