In the event dashboard click on "Content" from the side bar.

On the left side menu, under “Settings”, click on “Manage Categories”.

This will list all the categories for sponsors that are present, in order.\
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To change the order of the categories, drag and move the categories card to the desired position in the list.

You will get a confirmation message once the items are successfully reordered.

How to add a sponsor to your sponsor listing page?
Read here
How to assign a category to your sponsor?
Read here
How to order sponsor categories?
Read here
How to order sponsors within a category?
Read here