The Viewer currently provides four screen view modes: Normal, Stretch, Fullscreen, and Fullscreen Stretch.
Fullscreen Stretch is essentially "Fit to Viewer Screen": the Host screen is fitted to the Viewer screen.
Please add the opposite mode as a fifth option: "Fit to Host Screen." In this mode, the Viewer window is fitted to the Host screen. Its size remains fixed and the window cannot be resized.
In Normal view, if the Viewer window size changes, the Host screen resolution does not change with it. A larger Viewer window shows unnecessary blank space, while a smaller window introduces unnecessary scrolling. Either condition makes the remote session harder to operate.
Related requests focus on adjusting, restoring, or remembering the window size after this difficult-to-use state occurs. This request is different: "Fit to Host Screen" prevents that state from occurring by keeping the Viewer window size fixed.