Usually, when I enter Layout Mode the whole screen (I have a widescreen display) has a white background with page and gridlines, etc displayed over the width (and depth) of the screen and I can utilse the whole of the screen to insert and manipulate fields/objects etc.

However, on one particular dbase file, in L/O mode, the layout seems to restrict to just the parts and the rest of the screen background is blank grey - with no gridlines etc. Objects and fields do appear in this grey screen area (to the right of the L/O parts) but they cannot be dragged or dropped, only manipulated using the keyboard (see top picture attached).

Draft versions of this file display in the normal way in L/O mode (see bottom picture attached), so I presume it is something that the users have done to it…. or not … But for the life of me I cannot figure out what is going on or how to revert to a “normal” display. Any help would be appreciated.

You'll find that Layout mode the View menu -> Page Margins option has been selected.

OMG... (bemusement at own stupidity ) ...so it was. Thank you Vaughan.