This can be used to place names in any room or to place the floor name shown on the map. For this, go to Text Mesh List in the Map Tile Builder inspector and press Add Text Mesh.
A new text mesh is attached inside the map part transform.
Configure in the inspector the size and content and place where you need it.
If you press play, the text will be shown in both the Minimap and map window menu.
You can add as many text mesh as you need in every map part. You can see in the gizmo, that every text mesh is linked with its map part owner.
To remove any of these meshes, press the X button, and both the object in the scene and in the list are removed.