I can't change the program that LyX uses to view pdfs. Currently LyX is using Xpdf to show pdf output, which is not an ideal program.
I've looked at other solutions to this problem and they have not worked. Changing the preferred viewer to xreader in preferences and then reconfiguring doesn't work. I would like to avoid changing files and stick to the LyX gui.
I'm using Linux Mint 18 Cinnamon 64-bit and Lyx 2.2.2.
Edit: Apparently if I export as a pdf, it opens it with xreader. Not sure why it insists on using xpdf when I hit the view eyeballs.