A Galaxy Tab S7 can be used out-of-the-box as second screen for a Windows 10 laptop or PC connected on the same Wifi. But what about using this tablet as additionnel screen for a PC connect via ethernet ? The solution is SuperDisplay. And it works for most Android Tablets...
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You won't be able to connect your Galaxy Tablet S7 as second screen with your windows PC, as explained here, if this one is not connected via Wifi.
It's a pitty as using a tablet with a pen to do photo editing for example is really great.
The solution is simply to use an alternative "wireless display" solution such as "SuperDisplay"; install the App on your tablet and the related drivers on your PC, et voilà !