I’ve found a solution for this. If someone wants to know, you can see the answer here: Viewport Modes in Unreal Engine | Unreal Engine 5.2 Documentation
You need to use a command in console, in this case it is: ‘viewmode lit_detaillighting’
If you want to use this as a default, you need to add an “event begin play” in your level blueprint with the node “Execute Console Command”. Have a nice day!