There are 2 sets of zoom controls in Flightplan. The Map Options section in the lower right of the main window contains the default zoom level (and other settings) that the map will revert to when the map is recentered. The map recenters anytime a waypoint is selected in the grid or a pushpin clicked…
Cockpit Map
Flightplan is a Google Maps flight planning add-on for use with Microsoft Flight Simulator 2020. Cockpit Map allows you to use Google Maps real time in flight. You can use Flightplans drag-and-drop interface to create a flight plan anywhere on earth. You can then load and fly it in MSFS 2020 World Map and Cockpit Map will follow you into the cockpit so you can view the real time Google Maps terrain, road map, satellite views and street view 3D imagery as you fly.