brent To be honest, I used a command I saw on the Solus docs.
It was clr-boot-manager set-timeout 60 I believe. I though of just setting it to a pretty high number, like 1000 seconds or something, but I actually prefer if the countdown were disabled but the boot screen still showed (which, I know, would lock the computer on that screen until I saw it and chose an OS).
I'm probably the one missing something, since I don't know how to do that via terminal. But thanks, I'll check out efibootmgr.
PS.: From what I've seen online, set-timeout 0 would cause the boot screen to be skipped by default, which unfortunately is the opposite of what I need. I think back in grub setting it to 0 would do exactly what I described. Hence my confusion.
