When you design a progressive disclosure try to follow a simple rule — show less, provide more. In order to achieve good UX, you must get the right split between initial and secondary features. You have to disclose everything that users need up front, so that they only have to progress to the secondary display on rare occasions. The primary list just can’t contain too many options.
Most people think good design is directly related to beauty. They’re wrong. Good design is about executing a desired outcome through visual communication. Did you notice how ugly our first slide is? This is intentional.