This time select disk0 to install OpenCore to your Mac internal drive, then select the EFI partition.

When it finish to install OpenCore, it will ask to reboot your Mac. While it reboots, hold down again the [option] key to enter one last time the boot disk selection.

After you enter the disk boot selection, hold down the [option] key and select the EFI disk to make this the default option.

Done! You succesfully installed Sonoma on your Mac!