Settings
Add-ons settings
For almost all installed add-ons on your website you have settings for each of them.
You can simply access it via the listing by click on the gear:

By clicking on it the card will flip over and then all the settings will appear:

The custom views allow you to override the way AcyMailing inserts content in the editor.
Here is a dedicated documentation page for this feature: https://docs.acymailing.com/developers/customise-inserted-content#using-a-custom-view