When you create new or edit a title slide, the Edit title screen will be shown. You can change the background color of title slide at the bottom panel.
Button Add text is used to add new text/caption to the title slide.
Each caption has different properties.
Content, font, color, and size are changed by using controls at the right panel.
You can also drag and drop the caption to change its position.
The duration of each title can be changed at the quick tools in the project screen.