In my day job life, I’m a screenwriter. There’s a handy convention in screenwriting where if you have a title-less project, you can just say so. “Untitled Melissa McCarthy Project.” “Unt. Teen Sex Comedy.” “Unt. Jason Statham Shoots People in the Face Thriller”.
I’m still a babe in the woods about fiction publishing, so I don’t know if this exists in other fields, but I’m sticking to what I know. My current work in progress is a contemporary romance about an ordinary girl and the high-ranking politician she falls in love with, set against the backdrop of DC politics. Naturally, all my files are just “Unt. DC Romance”. At some point I imagine I’ll need to give it an actual title, but for now I’m coasting.