Hi Rani, It's Fred again.
I admit to be uncomfortable working in metrics, so I think I was careful trying to repeat your instructions.
At least I tried to be.
I never even get to the Page Editor because there no way I can fit those two prints  onto the page. So I know I goofed up something

If I just take the space provided in the (Portrait) horizontal dimension, you have me with 924.6 mm printable area..
If it take that dimension from your print sizes (side to side)  Print A, 582.6   plus Print B  352.8, =935.4
I cannot make that fit.
On the other hand, if I do a Freehand mode, I can lay one over the other.
I know I probably mixed up something i my conversions, but I am not worried about a stray mm here and there
Doctor Appt.
Be back in a couple of hours,

Fred

Ok
Rani
Thank you for your consideration on my inability to cope with too many metrics.

I was able to reproduce the set up, but when I went to Page Editor it stayed normal as seen on the main screen
Getting closer,
Fred
Last screen snap is the Editor