Hey there, @larzyau
Bo here from Shopify Support!
This can be done from your navigation settings. Our menu items are always set up manually - there is no way to default it to being alphabetical automatically, merchants have complete control over the order in which the items show up.
You can edit this by going to Online Store > Navigation. From here click on Main Menu (or whatever you have the main menu named as. Once you are in the main menu you can press on the button beside "Shop Now" to expand the drop-down list. You can then drag the menu items to be in the order you would prefer:
Let me know how this goes and if there is anything else I can assist you with, I'm happy to help!
All the Best