Once a connection is established you will see on the top of the screen a small arrow, that will give you access to the connection toolbar.
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Click on the connection middle top arrow, and the toolbar below will appear.
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Refresh
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The Refresh button performs a reconnection with the server, using the same parameters as the current connection, except for the screen size values, that will be updated to the current screen size (only if scale is on).
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Scale
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By clicking on this option, you will have the connection image scaled. The original desktop size will be the maximum limit size applied to the connection.
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File Transfer
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Click on the File Transfer button to go to the File Transfer Manager.
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Disconnect
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Click to close the connection.
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