This dialog allows you to enable or disable rulers.

Edge of the screen Corresponds to the edge of the screen.
TV margins In ffDiaporama, the TV margins are of type "Title safe area" and are defined on 90% in width and 90% in height, for all the project geometries.
Centre of the screen Corresponds to the center of the screen.
Unselected blocks For all the objects which are not a part of the selection, create rulers for the top, bottom, left and right edges of blocks as well as for the centers of blocks.

Remarks:

See also