Ctrl w gives you the “windows command mode”, allowing the following modifiers:
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Ctrl w + R – To rotate windows up/left.
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Ctrl w + r – To rotate windows down/right.
You can also use the “windows command mode” with navigation keys to change a window’s position:
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Ctrl w + L – Move the current window to the “far right”
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Ctrl w + H – Move the current window to the “far left”
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Ctrl w + J – Move the current window to the “very bottom”
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Ctrl w + K – Move the current window to the “very top”
Check out :help window-moving for more information