Samsung has recently released a software update that allows Samsung Fold to support Samsung Dex for PC use. This mode allows you to connect your phone to your Windows or Mac computer via a USB cable, use the monitor, keyboard, and Computer mouse at the same time
The Samsung DEX app for Windows and Mac can be downloaded directly from the Samsung website here: https://www.samsung.com/global/galaxy/apps/samsung-dex/
For updates that add DeX support, there will be a software version. F900FXXU2ASKB, which includes security patches in November, and the LTE version is being released in France and in other countries.