If you are creating new subcollections on your Google Mini (v1), and you want to search them from a drop down menu on the frontend, you will need to refresh the frontend to do it. Sound confusing, just do these steps (the same goes for turning on the menu for searching subcollections in the first place):

1. Login to the admin area and click on the collection name, then ‘Edit’
2. Click ‘Configure Serving’ then ‘Output Format’
3. Click the little arrow next to ‘Search Box’
4. Click the tickbox next to ‘include a menu to search by subcollection’
5. Click ‘Save Page Layout Code’

Note: This can take a few minutes to have an effect on the frontend, so if you don’t see a change to your search page immediately, just hang on and try again in a few minutes.

If you were just trying to turn on the menu of subcollections, that’s all you need to do. However, if you’re trying to get your new subcollection to show, you need to do these two steps again:

4. Click the tickbox next to ‘include a menu to search by subcollection’
5. Click ‘Save Page Layout Code’

That will cause the menu to update. You don’t need to wait for the frontend to refresh when doing this, just go through the first steps to switch the menu off, save it, then re-tick the box and save again.