You have opened a project. Project data > Parts / Devices > 2D panel layout navigator. In the 2D panel layout - <Project name> dialog, you used Popup menu > Settings to select one of the Manual input <...> options from the Apply group box. You are in the graphical editor on a "Panel layout" page. Select the Popup menu > Place on mounting panel on an unplaced part.
This dialog allows you to manually define the dimensions of non-placed parts when placing them on the mounting panel.
The following dialog elements are available:
In this group box, enter the Width and Height values of the part to be inserted.
In this group box, enter the values for the horizontal and vertical clearance of the part to be inserted to any neighboring part.
See also