Hello, I want to be a topic selector in the PPT of the knowledge contest. When I click on it, I link to another one. When I come back, the button will disappear How to set it?

1. On the theme selection page, complete all buttons and set hyperlinks.

2. Set the custom animation of each button to exit-disappear. Then, click Timer to set the trigger for clicking the button.

3. Set the back button of the hyperlink page. Hyperlinks return to the topic selection page.

Ok.