1. How to customize the unsubscribe page and design content？
  2. When clicking to unsubscribe, the V5 version has an option to display the user's unsubscribe from the questionnaire. Does the V9 version have the same functionality?

Hi,

Since version 9.7.0 you can add and configure an unsubscribe survey with predefined answers on the unsubscribe page. The unsubscribe reasons will be available in the user's history and in the list edit page.

In the configuration you can specify you want to display the unsubscribe page within your own template. In case you want to change the way the unsubscribe form is displayed you can customise it using css. In case you need to make changes in the html you can create a page override. https://docs.acymailing.com/developers/create-a-page-override

Because I set Custom answers,but can not to display
like this

I'm glad you were able to get it working. Enjoy your Acymailing.