Object space dimension

Hello, does he know how to resize my object space.
Indeed, recently it has been halved horizontally (I don't say " window ", I am happy to see it as a single window)
Thanks in advance
Phil

Hello @Philippe_LE_MARECHAL could you attach a screenshot to us?

objet.pdf display (1.3 MB)

Hello, here is
Have a nice day
Phil

Hello, I don't know the Mac, but you can if you have this command on Mac run this command and check your graphics settings: Help