How can I get to the "Settings" on the FUEL LOG app (Simon Morganthaler's app)?

I just managed to get the context menu on a Galaxy S7 by switching to one-handed mode with softkeys turned on and then long pressing right softkey. Long pressing the hardware back button did not work. Hope this might be helpful to other desperate FuelLog users.
 
I used the app Menu Button (No root). Once installed a short press will open the hidden menu. You may have to select Menu Button from a list of keyboards first but after that the short press will open the hidden menu.
 
I just managed to get the context menu on a Galaxy S7 by switching to one-handed mode with softkeys turned on and then long pressing right softkey. Long pressing the hardware back button did not work. Hope this might be helpful to other desperate FuelLog users.

Thanks Bernd. This is the method that worked for me on my S7.

Happy days!