What determines shown keyboard action key?

I can’t seem to find anything about this on the web but depending on which screen of my app is shown when the user taps into an input box sometimes the keyboard shows a GO key and sometimes the RETURN key; ie shown at the bottom-right of the keyboard .

I’m building for both iOS and Android and ideally I’d like it to always show return key.

How can I ensure the keyboard always shows RETURN key?

So for most cases, the Go button will show if you are doing anything with forms.
There isn’t a way to disable that in javascript, and I don’t believe the keyboard plugin supports it.