Your GParted image shows missing flags for '/' and '/home'.
The Fat32 Partition is only needed if your machine has UEFI/EFI and it would be too big anyway - Fat32 partition size for EFI only needs to be 50 Mb not 500.
For '/' (root file system) I would make 50 Gb - if this is a spinning hard drive then Ext4 is fine - if it is for an SSD then it should be Ext2.
The same applies to '/home'.
My initial advice on partitioning was 30 Gb for '/' on the unofficial manual for Zorin 15 but then I had an issue with another OS based off Ubuntu that ran out of space, so I would always aim for 50 Gb for '/'.
Check out my ancient Dual Boot Video here (Zorin 9 with Windows 7) 34 minutes 50 seconds in:
https://vimeo.com/manage/videos/110085401
Unofficial manual:
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