[Q] switching between keyboards while texting topic

I have swiftkey installed and I just got this fun keyboard called Gif Gif Gif that lets you send gifs in text messages. The gif keyboard sucks as a regular keyboard so I want to be able to switch between SwiftKey and Gif Gif Gif but it doesn't allow me to switch in the texting app ( I use Textra). I felt like in the past you were allowed to change the input by holding down on the space in the text input but I now find that it doesn't work anymore.

Any solutions or knowledge of this?