A cookie consent banner is a notice that is displayed on websites and other apps upon the user's visit. It is designed to inform the users of the use of cookies, consumer rights in regards to those cookies, and to request the user to grant consent to activate those cookies and process their personal data.
Here are the steps to create a Cookie Banner.
1. Go to Settings > System > Policies & Agreements

2. Click "Cookie Policy”
3. Fill out the necessary fields. You also have an option to use the given template

4. Click “Save”