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For a 3x3 display wall, can the 4x9 Seamless Video Wall Processor show one HDMI source across all screens?

We also need to switch to four separate windows sometimes.
Yes, it can do both. The 4K60 HDMI 8×9 Seamless Matrix and Video Wall Processor shows one HDMI source stretched across all screens (your 3×3 wall), and also supports multiple windows — up to four separate sources in different zones at the same time.
So you get the single-image mode for presentations, and you can switch to a four-window layout when you need to monitor several sources side by side. Layout switching is done through the control interface or WEB GUI.