Hey Nick 🙂
Whatever you have entered in the ‘Number of events to show per page‘ setting under Events > Settings > General (screenshot below) is how many events will display at a time, including map view.

If you wanted to work around that, you could either increase the number of events in that setting or overwrite the number of events in map view using tribe_get_events.
Please let me know if this helps answer your question and have a great rest of your weekend. Cheers!