Viewing problems. Lines not solid

@eriley1811, Lizbeth, It may be that your a victim of having the very latest (rather than obsolete hardware.)

Your processor is the latest 7th generation Intel iCore APU
with the latest Intel HD (Iris Pro) 620 integrated graphics.

What graphics driver version do you have installed ?
(There are a few driver updates at the Dell Support for your product.
They are naturally a bit behind the Intel drivers.)

There is a relatively new Intel OEM beta driver available.