You can to change the time scale (zoom in/out) on all the following schedule views:
- "When" view of a project
- "Who" view of a project
- "Schedule" view in multi-projects
- "Gantt" view in multi-projects
- "Calendars" view in multi-projects
To do so, click on the "Zoom/magnifying glass" icon at the bottom right of each view mentioned above. A time scale opens. Select the desired level by directly positioning your cursor on it or clicking "+" or "-".
Note: The zoom level is maintained when you return to the view in question.