It is often needed to open two Entities at the same time. I would suggest that when pressing Ctrl (or Alt/Shift), the second Entity opens next to the first one.
Alternatively, and this is a bit more complex but better, we could add a “Pin” button to keep the open Entity fixed, allowing you to switch even to another Space while still keeping it visible.
P.S. I’m aware of the “Go To/Search” feature, but it’s not as convenient / quick.