If we go back to our issue view, we'll see that there's now a related branch:
Let's click that branch name. We'll be taken to a view of the changed code. You'll see in this view that we can see the author of the commits and the changed files, including additions and deletions. Up at the top, you can also change the Source and Target if you wanted to compare different branches, such as merging a sub-feature into a feature branch, or the master into a staging branch:
Now, let's click the Create merge request button ...