device screen size

I'm developing app for Samsung Galaxy Tab A7 Lite (model SM-T220)

Initially I've been designing for 1340x800 with fullscreen configuration (without status and nav bar) but am having elements not fitting on page. Setup a screen width and height tool within FF app and am getting 1006.5727158 x 600.93893484.

Found additional screen information using "Touch Screen Calibration" app:
screen size (pixels) 1276x800

dimensions (dpi) 958x601

density ratio 1.3312501

density dpi 213

Per inch of pixels 196

Which screen size should I use for project? Is there a setting where I could force app to use maximum screen size of 1340x800 by changing dpi?

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