SourceTree: Why aren't branches showing as merged?

Merge (no fast forward): Merge with a non-linear history that preserves all commits.
Squash commit: Merge with a linear history that combines all source commits into a single commit on the target, or squash merges the PR.
Rebase and fast-forward: Rebase the source commits onto the target and fast-forward.
Semi-linear merge: Rebase source commits onto the target and create a two-parent merge.

Can you help me understand - after merging 'release/1.0.0' into 'master' why they dont show as merged in the SourceTree graph?

I did the merge via a Pull Request using Microsoft DevOps

Then checked out 'master' locally and did a Pull - this is what the graph shows now:

Solution

There are four ways to "merge" a pr on DevOps, according to the documentation:

Merge (no fast forward): Merge with a non-linear history that preserves all commits.

Squash commit: Merge with a linear history that combines all source commits into a single commit on the target, or squash merges the PR.

Rebase and fast-forward: Rebase the source commits onto the target and fast-forward.

Semi-linear merge: Rebase source commits onto the target and create a two-parent merge.

Only two of those (with "merge" in their name) make a merge commit. You probably did one of the others. My guess is that you did a squash.