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To auto-resize windows resolution automatically (so you don't have to do the manual sizing below) go to the Access Menu in the previous line, and click Display -> ResizeRemoteScreen, then click "Done" and "Done" again to close the menu.
To resize the window manually: Click on System->Preferences->Display, select 'Resize remote screen'. When you change the screen resolution you may not see enough of the window to click "Apply". On MAC: To do this on the keyboard: hit "option-A". On Windows: use "alt-A".
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