Hi, and welcome to the forum!
This has already been discussed thoroughly...
This is normal, boot partitions are typically around that size. I'm glad that you like ZorinOS but maybe there's some other underlying issue, could be the because of something you installed during an update inadvertently or perhaps even at the hardware level. Just saying this in case you experience similar issues again while using ZorinOS.
Feel free to change it however you like! You can find plenty of examples for inspiration in this thread: