Hello before installing Zorin, I installed Linux Deepin alongside windows.
So now I have Windows, Deepin, and Zorin on my PC.
I Installed them on separate disk, 1 SSD for windows, another SSD for Zorin, and Deepin on HDD.
You can use the Partition manager Gparted to delete the Deepin partitions using the (-) button after selecting those partitions.
This space will then be listed as Free Space. You can format it or reclaim it by resizing (moving) an adjacent partition into that free space.