Below we may get step-by-step screenshots,

Step 1 - Click on "Start" button.

Step 2 - Click on "Server Manager".

Step 3 - Click on "Add roles and features".

Step 4 - Click on "Next".

Step 5 - Keep selected "Role-based or feature-based installation" and click on "Next".

Step 6 - Select/Verify the server name and IP address, then click on "Next".

Step 7 - Locate "Hyper-V" and click the check box.

Step 8 - Click on "Add Features".

Step 9 - Confirm the tick mark and click on "Next".

Step 10 - Click on "Next".

Step 11 - Click on "Next".

Step 12 - Locate "Network adapter" and click the check box.

Step 13 - Confirm the tick mark and click on "Next".

Step 14 - For default setup, Click on "Next".

Step 15 - Verify locations and Click on "Next".

Step 16 - Click on the check box "Restart the destination server automatically if required".

Step 17 - Click on "Yes".

Step 18 - Click on "Install".

Step 19 - Wait for some time, system will restart.

Step 20 - After restart, wait for some time until installation completes.

Step 21 - Click on "Close".

Step 22 - Click on "Tools" button.

Step 23 - Click on "Hyper-V Manager".

Step 24 - Click on "Connect to Server…" button.

Step 25 - Select “Local computer“ and click on "OK".

Step 26 - Click on "Virtual Switch Manager…".

Step 27 - Click on "Create Virtual Switch" button.

Step 28 - Select "Network adapter" and click on "OK".

Step 29 - Click on "Yes".

Step 30 - Once done successfully, a new “Hyper-V Virtual Ethernet Adapter” will be created.