1. As shown in the figure below, you need to insert a secondary title immediately after the secondary title after generating the directory, as shown in the figure below;

2. Position the cursor under the [Next] title and enter a new title, such as Next, as shown in the figure below;

3. After setting, select 【 Next 】, and then click the title 2 on the menu bar, as shown in the figure below;

4. When you return to the editing area, you can see that [Next to] has become a secondary title style, as shown in the figure below;

5. Return to the directory page and click Update Directory in the page, as shown in the figure below;

6. Select Update the whole directory in the Update Directory menu, as shown in the figure below;

7. After waiting for the page to refresh, you can see that there is a secondary title [Immediately] after the secondary title, as shown in the figure below.