New Blender projects not so new???

Weird question. I seem to have unknowingly set blender to start new projects from a project of mine I was working on a few weeks ago (concurrent with when this bug began occurring.) When I open Blender, or start a new project, instead of getting the cube with a camera as default, it instead starts from a project of mine I was working on when this began to happen. If the project weren’t already a complex, sprawling project I’d just live with it, but because it loads with dozens of meshes/textures/lights/nodes, I have to erase all that first before I can even begin a new project. Is there some way to reset this back to the old cube? Thanks.

Try looking in the menus!
File / Load Factory Settings, then Ctrl+U to save as default