I’ve just found a possible solution here, but it is quite old, and I don’t know if it still works. I will try it tomorrow.
After complete installation, don’t reboot.
Quit the installer with CTRL+ALT+F2 and : chroot /mnt/sysimage grub2-install --force /dev/sdxx
where sdxx is the location you want install bootloader, for me it’s sda2 grub2-mkconfig -o /boot/grub2/grub.cfg
after quit chroot with “exit” command and reboot.