In most Planfix sections, the work area takes up most of the screen. It's on the right-hand side, under the main menu and the tools panel. Basic section information is displayed in the work area.
To the right of the work area is the area where you can switch tabs (if a single Planfix object such as a task is displayed in the work area, like in the screenshot above). To the left of the work area are filters (if lists are displayed in the work area, such as lists of tasks).