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Back out to System Preferences and select Mission Control. Place a check in the Displays have separate Spaces box. If your dock is at the bottom your display, it will be at the bottom of both displays.
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Customise keyboard shortcuts You can customise some keyboard shortcuts
by changing the key combinations.On your Mac, choose Apple menu > System Settings, click Keyboard in
the sidebar (you may need to scroll down), then click Keyboard
Shortcuts on the right.In the list on the left, select a category, such as Mission Control or
Spotlight.In the list on the right, select the tickbox next to the shortcut you
want to change.Double-click the current key combination, then press the new key
combination you want to use.You can’t use each type of key (for example, a letter key) more than
once in a key combination.Quit and reopen any apps you’re using for the new keyboard shortcut to
take effect.If you assign a keyboard shortcut that already exists for another
command or app, your new shortcut won’t work. Find the menu command
that’s using it, then reassign the keyboard shortcut for that item.If you want to return all the shortcuts to their original keystroke
combinations, go to Keyboard settings, click Keyboard Shortcuts, then
click Restore Defaults in the lower-left corner.
Thanks all. ctrl+cmd+shift+4 is optimal although finger intensive.
Now if only I could get the bar at the bottom to appear on both screens I'd be happy.