my map wont load when project is loaded

im making a 3rd person open world rpg using world composition. every time I open my project it loads ‘untitled’. I have to open my container level everytime.
im worried when I finally build my game that it will load the untitled map and my game wont run. how do I have ue load my container level every time the project opens??
is there anyway I can get some help from an expert at epic on this??

Project Settings > Project > Maps and Modes > Default Maps