How do I do that, it’s now somehow installing Mojave must have been on a separate partition but I wanted Catalina as fresh can I do what you said without the security start up?
The reply from the last poster was correct, it does not make one 0/1 difference if you install Mojave first and then Update to Catalina.
Internet recovery installs the version of macOS that was shipped with the Mac. I don't see why there would be any difference worth worrying about between a totally clean Catalina install and a clean Mojave install updated to Catalina. Just let the Mojave install finish up and then update.