Use full form setting
From Planfix
In Planfix, you can configure how the system behaves when you click on an item (a task or a contact). This is configured in the Planner lists settings:
If the "Full" option is selected, clicking an item opens a new panel on the right side of the screen displaying the object’s full view form:
If the "Short" option is selected, a short view of the object's card will appear:
You can configure the appearance and contents of the short view.