If Auto Scale is enabled, the display automatically adjusts when the
Viewer window size changes during a session. When you access a channel using sharing, the display adjusts to match the input resolution selected by the primary user of that channel. This prevents the primary user's display from being affected. If the resolution changes any time during a session, the display is adjusted automatically.
From the menu bar, select View - Scaling - Auto Scale to allow the server image to be scaled automatically.
or
From the menu bar, select
View - Scaling - Full Scale
or
Select a screen resolution from the
Scaling sub-menu.