How to reverse buttons on Kindle Oasis (10th gen)

I just installed koreader a week or so back, so I have not gotten comfortable on all the settings / options ("not comfortable" = clueless). My Kindle has 2 buttons on the same side, one above the other. The default is the lower of the two turns the page back, the upper pages forward. In the Kindle settings I'm able to reverse this, and have done so. However, once I start up koreader the buttons are back to their default settings. Is there a menu option to change this, or something else I can do to bring the button function back to the way all normal, right-handed, right-thinking, toilet paper over the top, God-fearing people want this thing to work?