I wanted to in Bitbucket Cloud: Always View Pull Requests Side-by-side.
I was searching on Google with the phrase "Bitbucket Cloud: Always View Pull Requests Side-by-side" and I found no good first hit that would help me.
Got help from a colleague to do it. Inside a pull request: Settings
(shown boxed in red, below) > View
:Side-by-side
> Save
.