The steps to modify the title text in Da Vinci Fusion are as follows:

1. Add a text title to fusion.

2. Enter the fusion interface, and in the setting panel on the right, right-click "Role Level Style" in the text area.

3. Select the text part to be modified in the monitor, and then click "Modifiers".

4. Double-click the extended tab in the "CharacterLevelstyling" area to adjust the text separately.

According to the above steps, you can modify the title text in Da Vinci Fusion.