This system does not have hardware multiplexing -- the Intel GPU controls all video outputs.  
Can anybody tell me if the Inspiron 7610 (16") with the RTX 3060 graphics card has the Direct Graphics Controller Direct Output Mode BIOS option like the XPS 17" with the 3060 card?  This routes the 3060 video directly to the Thunderbolt 4 or HDMI ports (rather than by Optimus through the CPU graphics) so that G-sync and other NVidia specifics work properly.  From the XPS 17  documentation - Enable Direct Graphics Controller Direct Output mode You can connect four external displays or two 8K displays on computers with the NVIDIA GeForce RTX 3060 Max-Q discrete graphics card installed. To do so, you must enable Direct Graphics Controller Direct Output Mode in the computer's BIOS. When enabled, the graphics signals are sent to the external display using the discrete graphics card instead of integrated graphics. By default, this mode is disabled in the BIOS. To change Direct Graphics Controller Direct Output Mode in the BIOS: 1. Restart your computer and press immediately to enter the BIOS.  2. In the BIOS screen, select Display.  3. Select Direct Graphics Controller Direct Output mode.  4. Select Enable.  5. Save changes and exit the BIOS.
Inspiron 7610 with RTX 3060, Direct Graphics Controller Direct Output Mode?