How to filter out internal IP addresses from Google Analytics 4 (GA4) data

(1) In order to set up IP address filtering in GA4, you need to be an Editor or Administrator on the account.

(2) Watch the following 87 second video that shows you how to filter out IP addresses:

Google also provides a written walk-through: [GA4] Filter out internal traffic.

You can find your own IP address by Googling, "What's my IP?" or visiting showmyip.com.