Adding new fields to the view AFTER adding the on/off field doesn't show the new field in the on/off field settings

I set up my view with 20+ fields and then set the on/off field up at the end.

Since i've added new fields to the content type, search api and now wanting to add these new fields to the view.

I go in to the on/off field settings and the new field I added to the view does not show in here.

I have to manually remove the on/off field, then re-add it to show all the fields so that I can select to show/hide it.