@ArtElixir it depends on what sort of collection you've made but it's easy as drag and drop the products into whatever order you like
For cross sells - it's a bit trickier but doable - there's a burger menu where you can create a custom sort
Have a read of this https://help.zazzle.com/hc/en-us/articles/360000289534-How-Collections-Work
and https://www.zazzle.com/creators/playbook/collection+types
You can also search through the Collection forum for tips and tricks
https://community.zazzle.com/t5/new-collection-types-information/bd-p/collections
You'll soon get the hang of it
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