Ethernet tethering / Connect notebook with internet over phone with Usb-Ethernet Adapter and Lan-cable

/e/OS Smartphone Operating System Features & Applications
3

Try:

Hotspot and tethering > USB tethering on

then

USB Preferences (with phone connected to PC/Laptop) > USB tethering

If you want phone to always be in tethering mode under developer options see:

Default USB configuration > USB tethering