Ubuntu does not recognize windows and I’d like to delete windows. NOT dual-boot

I’m setting up ubuntu on an old laptop that has nothing on it. I want to get rid of windows and set up ubuntu 20.

Everything works fine I’m booting from USB but once I get to the installation screen, it does NOT detect an operating system.

This is the choice I WANT:

example

However, I do not do not get that “erase windows” option. Instead it tells me it does not detect an operating system. Is this going to result in dual boot? Or will the option “delete everything…” actually delete windows?