Starting with the release of Strategy ONE (March 2024), dossiers are also known as dashboards.
As of Strategy 2020, there are two out-of-the-box map visualizations available in a dossier: Geospatial Service (Mapbox) and Map (ESRI).

Should you only want to use one type of map, you can hide the other map icon in the visualization gallery using the following steps.
Strategy\WEB-INF\xml\configand find the visualizations.xml file. Make a backup and edit the original.
ajaxlist group and remove the configuration line of the map visualization you want to hide.
<visualization id="Mapbox" desc="Geospatial Service" desc-id="mstrWeb.15751" scope="18" style-name="MapboxVisualizationStyle" propsEditor="" is-mojo="true" widget-type="8" position="2"/>
<visualization id="Map" desc="Map" desc-id="mstrWeb.7736" scope="19" style-name="GoogleMapVisualizationStyle" propsEditor="visPropsIPhoneMapStyle" is-mojo="true" widget-type="6" position="5"/>