There are a couple of tricks you have to know to resize, zoom, and move your map around in ZwiftMap. This animation demonstrates it quickly, and below it the details are explained:
You can resize the windowsWindows The Windows operating system from Microsoft. in ZwiftMap after pressing Win+Alt+Z in Windows or Cmd+Alt+Z in macOSmacOS The operating system on the Mac computers from Apple. Drag the borders or double click inside the window to maximise it.
To zoom in and out you have to switch mode with Win+Alt+S / Cmd+Alt+S. It also enables the ZwiftGPS menu and lets ZwiftGPS react to mouse and keyboard input. Now you can zoom in/out with your mouse wheel while your cursor is over the ‘Zoom here’ area top-right.
When you are in the ZwiftGPS input mode (after pressing Win+Alt+S / Cmd+Alt+S) you can shift the map around inside the window. Just click and drag anywhere on the map (except for the ‘Zoom here’ area and the menu control).