Display order of Add-ons on Product Page
You can control the order in which Add-ons display using the "Display order" text box
Controlling the order of combined catalog and individual product add-ons
App combines individual product add-ons with catalog add-ons and applies ordering based on the Display Order specified.
Display order of a much lower or higher value can be specified for catalog Add-ons in order to control its display order, for example if you would like catalog add-ons appear before individual product add-ons on a product page, you can give a display order of 1, 2, 3 etc to catalog add-ons and display order of 10, 11, 12 etc to individual product add-ons, similarly to make catalog add-ons appear after the indivudla product add-ons give them a display order of 10, 11, 12 etc.
Order of add-ons on a cart page
As on a cart page there could be multiple products with add-ons, display order works a bit differently then product page.
Firstly individual add-ons for each products are displayed in the order specified by display order, then catalog add-ons are displayed with in an order specified by disply order and lastly add-ons grouped by varaints (add-ons with variant selector dropdown) are displayed.