How to open more windows in iMAC. in a BookMac I used "control" + "->" keys

On your iMac, there are two ways to have more working areas:

More desktops (Spaces)

• ⌃ + → — switch to the next desktop

• ⌃ + ← — switch to the previous desktop

• ⌃ + ↑ — open Mission Control

• In Mission Control, click + at the top to add another desktop

More Finder windows

• ⌘ + N — open a new Finder window

Apple: Work in multiple spaces on Mac

Apple: Mac keyboard shortcuts

Control + up arrow