After logging into Designer, follow these steps:
You begin on the home page of Designer's editor and are thus in the Site editor view. Click left on the menu item Site settings.
You can now see the Site status page of the Site Settings area. Click on Cookie warning in the menu on the left.
2. Set up
Select in the drop-down menu Enabled whether you want to disabled or enabled a cookie warning.
To create your cookie warning, click on SAVE.