@asolarmg
See this page:-
https://www.sony.co.uk/electronics/support/articles/00031431
Note that this presumes a wrongly shaped picture is a fault that you want to correct.
Which is perhaps the case; though here it may be more an adjustment that you want to provoke, e.g. making a correctly transmitted and displayed 21:9 picture lose its black bars by stretching the image vertically, or by zooming it to fill the 16:9 screen, cutting off the left and right sides of the picture.
But this does not matter - it is always a case of personal taste how you want your picture to look.
My favourite bedtime reading is a Sony product manual…
