Some protocols have an option to scale the remote desktop to fit your display area.
Select View ▸ Scaling, or click the Scaling toolbar button.
Select View ▸ Keep Aspect Ratio if you want to constrain the aspect ratio of the remote desktop inside the display area, or deselect the option to stretch the remote desktop to fill the available space.
This option can be toggled only if Scaling has already been enabled.
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