In Evernote program, click on the ‘View’ pull down menu and choose ‘Show Tab Bar.’
This lets you have Multiple Tabs, like a browser, with your choice of Notebook in each tab. I am keeping my ‘1 Inbox’ Notebook in one tab, my ‘2 Current’ in another, and the current Notebook that I am working on in a third tab. This is much more efficient than clicking from one area to another and back.