solusmint you have to type (I have to hit F11) F-Something to bring up a boot menu when you are booting up.
Fedora's Grub should have kicked solus's bootloader's a** and I'm shocked you have solus and not fedora. 99 times out of 100 for me Grub always usurps the other bootloader. either way you should you sould shut off. then power on. then find the F key (tap tap tap tap tap) that give you the boot menu.
****Unless someone knows a way you can update Fedora bootloader....in Solus?