I would like to allow for the reordering of selected items in a multi-select but I can’t find where/how to enable this.
This feature is not built into Select2, but you could probably create a custom adapter to do what you want. Depending on whether you want to reorder the “tags” that are shown when the dropdown is closed, or the items in the dropdown, or both, you would need to create a custom SelectionAdapter or a custom DropdownAdapter (or both).
This article might be helpful in understanding how to create a custom adapter: https://bojanv91.github.io/posts/2017/10/extending-select2-with-adapters-and-decorators
Good luck!