I would have liked to open Evernote app on my Mac similarly as I do on my iOS devices (iPhone or iPad). On my iOS devices I enter a simple passcode. I am surprised that this is not available for Evernote on Mac, since a Mac can be shared by family members (wife, children, etc).
Solutions such as signing out of Evernote app is not so simple. You have to enter both username and password, together with a 2-step verification code. Constantly signing out and in would be too cumbersome. A simple 4-digit passcode would hold.
It is interesting that passcode is available in Evernote for iOS devices and these devices are password protected. You must unlock an iOS device in order to use it. However, a Mac is usually unlocked if it is shared among family members. If you share a computer with your family, the computer is "open" for use. My point is that it is more necessary to have a passcode for Evernote on desktop computers or laptops, than on iOS devices (or android devices).
Some has suggested to have a guest account or that each member of family has its own account. The problem is that some software, such as Adobe Creative Cloud, are pestering with notifications across the user accounts, and even prompt for passwords! My 10-year-old kid (on his account) was very confused by such pestering notifications. So, having multiple accounts is not an ideal solution for my needs. A simple passcode would hold.