On the Map Editor, the pedestrian flow zones are not present on the map by default.
In order to activate the view, you need to click on the layers button in the bottom right corner of the Map Editor:
The layers panel will appear:
Click on the 'Display pedestrian flow zone' icon:
This will display yellow zones on the map, which represent the pedestrian flow zones:
Clicking on the yellow zone on the map will open up the side panel.
You can read more about pedestrian flow zones here: