Your Kobo Aura One can be a very good 8" pdf reader if you install Koreader app thereon.
We can read two-column RPG pdfs using Koreader's two column mode (four screens per pdf page), and if we want to quickly see the whole page for a moment, we just have to tap on the upper left corner for the little triangle to appear (triggers its pan mode), and then tap it again for the return of the two-column mode, or we can simply use two-finger pinch in/out, or various available multiswipes.
If all the margins have not been sufficiently cut using auto or semi-auto mode, we can use manual mode, or we can quickly crop margins on our PC/Mac instead, using Briss app or K2pdfopt.
https://www.mobileread.com/forums/sh...d.php?t=330673
We can also use Briss for the quick cropping of two-column pdf into one-column pages, so that we can simply use fit-to-width mode if our eink reader doesn't have two-column mode or it is not quick enough for our liking.