Several things work for me:

- switching between spaces switches my mental space too. I read and scan website differently based on what space I'm in. Like switching between tasks. Might be personal.

- "Little Arc" - just a window that opens in the view you're in, on any other app, and disappears after a set time, really is great for me to quickly look something up and have it be gone.

- Vertical tabs instead of bookmark folders work better for me as it opens the link "within" the folder, instead of a new tab

Not saying this is only available in Arc / Zen, but this is what makes it work for me.