No, that is not possible.
On a Prowise Max touchscreen, only one input channel can be active (visible) at a time.
This means you cannot simultaneously display the images from, for instance, a connected laptop via HDMI and another laptop via USB-C side-by-side. As soon as you select a new input (e.g., from HDMI 1 to USB-C), the display from the previous input will automatically stop, and the image from the new input will be shown.