I’m experimenting with a 2014 macbook pro upgraded to macOS 14.4 (Sonoma) with OpenCore Legacy Patcher, Linux Mint 21.3 Virginia and Linux Mint 21.3 Xfce.
First, I installed Linux Mint 21.3 Virginia and I could boot both to macOS and Mint. Then, I created another partition and installed Mint Xfce on it.
Now, I can only access both linux operative systems and macOS has disappeared.
What I don’t understand is why now the notebook boots directly to grub instead of booting to OpenCore Legacy Patcher
Odds are your Linux install overwrote OCLP. You’d need to install OCLP again and configure it to boot from either Mac OS or your Linux install.
And with GPT partition you can have 128 partitions so ~120 different OSes easily on a single drive.
Even more with btrfs or LVM.