if you are a developer how do you see a feature timeline?

According to your screenshot, seems you were using Feature timeline and Epic Roadmap extension.

It’s caused by you are using a team based backlog/ Feature Timeline, not a project level.

How to select team-level iteration:

1. You already created corresponding child iterations under the whole project.

2. But you still need to select them in related teams.

Click the default team’s settings in you screenshot. You could also switch team in the drop down list:

3.select iteration you need for the team

4. Now you will be able to see child iteration in feature pipeline.