The properties panel appears with the selection of an item. The context of the selected item dictates the content of the properties panel.
The basic properties
Set the width, heigt, position and rotation of a frame.
If you selected an image frame, you can also choose the fit and crop of the image in the frame.
By default, a frame is not animated. With these setting, you can set the behaviour of the intro, emphasis and outro of the animation.
By default, a frame does not have variables. You can set, unset and change the setting for a variable set to (in) the frame.