How to achive a gitlab graph during merge where the feature branch diverges from the parent, get one commit and merges back to parent as shown below

Question

Below is the gitlab graph which shows 2 sceneraios 1 and 2. When I make one commit in feature branch and merge back to the parent, I see both parent and feature branch are in same like as in sceneraio 1.

git lab graph

I want to merge as seen in sceneraio 2 where the feature clealy diverges, gets a commit and merges back to the parent.