GNOME Disk - Can I use it to remove POP! OS

I’m an old guy that continue to get myself into situations were I have risen to a incompetence.
What I have done is dual mounted Zorin 17.1 with POP!. It has been working great and now I want to remove POP!
I have opened Disk in Zorin and see the Volumes in the Disk.

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
loop0 7:0 0 4K 1 loop /snap/bare/5
loop1 7:1 0 93.3M 1 loop /snap/bluemail/170
loop2 7:2 0 104.2M 1 loop /snap/core/17200
loop3 7:3 0 55.7M 1 loop /snap/core18/2829
loop4 7:4 0 164.8M 1 loop /snap/gnome-3-28-1804/198
loop5 7:5 0 140K 1 loop /snap/gtk2-common-themes/13
loop6 7:6 0 91.7M 1 loop /snap/gtk-common-themes/1535
nvme0n1 259:0 0 232.9G 0 disk
├─nvme0n1p1 259:1 0 512M 0 part /boot/efi
├─nvme0n1p2 259:2 0 4G 0 part
├─nvme0n1p3 259:3 0 144.8G 0 part
├─nvme0n1p4 259:4 0 4G 0 part
└─nvme0n1p5 259:5 0 79.6G 0 part /

I have also clicked on the Volumes and can see how they can be deleted.
What I don’t know is what Volumes are POP! which I want to remove and which are Zorin.

I have this information as well: I have been told that the POP! OS in in nvme0n1p3 of size 144.8GB. But still don’t know how to remove it because I have also been told that: “…only deleting the Partition isn’t enough. You have to delete the EFI Entry for Zorin, too. When You don’t do it, You could get Issues when You start Your System.”

I don’t understand. Can you help me? Can you point me in the right direction? Keep in mind that I don’t know what I’m doing and don’t speak “Geek Speak”.

Ed

Couldn’t find a way to edit.

This issue is Solved!