I closed the content browser. how can I open it back up?

At the top menu row > Window > Content Browser. You can have up to 4 content browser windows open.

If you mean the Modes window(or scene outliner, details, etc.), they too are all in Window section.

is there something in file that can help me open it back up?

thanks, but i meant the window to spawn in BSP and volumes and light.I just don’t know what it’s called.

thanks! that helps.

wait wait wait, what did you do? Please tell me how to get it back up.