I noticed same issue a few months ago. Maybe started after the Sept 2018 update. I also switch back-and-forth from EverNote to other Apps. When I return to my “open” EverNote App, after a significant period of time, I’m taken back at EverNote “All Notes.” In order to get back to the Last Note I was working on, my hacks are:
1) on IOS / iPhone: Press “back Arrow” located upper left corner.
2). On IOS, Back Arrow takes me to: “RECENT NOTES.” The Notebook related to the last note I was viewing will be the first of the three “recently” opened notebooks.
3). Kind of a PITA because after I open the Notebook, I have to remember the Note Title & scroll to it. Or, if I don’t remember Note name, I use Hack 2.
1) using Hack 1 Instructions 1 & 2: With Last notebook OPEN, click on the 3 dots in the upper right corner (IOS), click on Note List Options. Then click on “Date Open” & that will put Last Opened files on top of List.
I prefer my notes to automatically open to the last note I viewed, but something changed with EV & it doesn’t do that anymore. Maybe there is a way to change how EV opens ?