nipoo, Working as designed.  The  USB-C power share is bidirectional, so a device can either send or receive power. Unfortunately, we did not have an option to disable it.
In my country having so many power drops so thought to buy a 65W power delivery power bank. My issue is the power bank getting charged instead of charging the laptop when I connect the power bank to the laptop via USB C. How can I stop USB Type C Power Delivery?
Dell Latitude 5421: Disable USB Type C Power Delivery