Resolution settings for the iPad

Greets, all:

I'm confused: If you go to FileMaker's page concerning screen stencils (https://support.filemaker.com/s/article/Using-Screen-Stencils-to-design-iOS-friendly-layouts-using-FileMaker-Go-14-or-higher-1503693076890?language=en_US), it lists the Width x Heigh resolution settings for the iPad 10.5" (2018) as follows:

The thing is, the layout's right-hand border in the FM Go solution I'm building (using landscape only) is about a centimeter shy of the right side of the screen using the recommended 1112 width; however, it fills up nicely at 1200, so what am I missing between what FileMaker says is the recommended width and the width I'm trying?

Also, I noticed that glyphs aren't showing up in date fields where you enable the calendar icon (at least in the desktop version.) 

Cheers,

Rich