So I want to make my page be as large as my laptop screen, and in the process read two pages side by side like a book.
I followed the instructions here . But I get this message when I click Add/Modify.
It happens on every page size I want to custom. I specifically want to edit the Screen one. Or at least add my own page name or format to the list.
How to make it happen?
Yes, I used that very button to arrive at the window where I'm putting in my custom sizes but there's no option on the new window to define a name for my custom page. And it's sending me to this "Not allowed" dialogue box (as attached on the body of the post).
I should also say, my "Replace Existing PDF" drop-down menu is grayed out and not selectable (you can see it on the attached image in the body of my post). Is it possible to fix it? I think fixing that will make my custom size work...
You can enter a name for the custom page size:
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