Not sure if this would be possible, but I have always thought that it would be nice if I could change the look of the the relationship field to look like the taxonomy field (multiselect). So you essentially would type in the relationship you were looking for and it would add it to a list, then you press an x on a term to remove it.
Would this be possible in some way?
This is not possible at the moment in ACF or by using any filters. https://www.advancedcustomfields.com/contact/
Thanks for the response. I actually just discovered that what I wanted to do can actually be done, with a Post Object and allow Multiple Values.
This is then essentially a relationship in the format of a taxonomy field.