How to disable creating new tags with select2 v4.0?

I've been struggling with this as well, but got it working after a few hours.

I had specified a few token seperators (because my visitors are allowed to create tags in a different spot in the website). Turns out the seperators are still applied even if the tags configuration is set to false.

Solution: tags: false and do NOT add a value for tokenSeperators. Keep multiple: true.

You can disable tags by removing tags: true when initializing Select2. Or alternatively, setting tags: false when initializing Select2. Tags are only enabled if the tags option is truthy, which it is when you are passing in true.

This should work - in the initialization of select2, try returning undefined from the createTag function like so:

createTag: function(params) {
                return undefined;
           }