How to remove a level and make the second level the starting one?

So i have this thing where i have 2 levels but i want to remove the first one since i don’t need it, and make a different level the ONLY level that is in the game. How would i do this?

You can go to File>Project Settings>Maps & Modes. You can change the default level to the one you want (Game Default Map). You are then free to delete the old level by selecting it in the content browser.

Hi overwatch, thank you for your help! (big fan of Half Life 2 my self) it really helped. Thanks again!