In this first part of a two-part article, Eduard Kuric analyzes the characteristics of effective toggle buttons that make it error-proof and prevent confusion and frustration of users.

The problem of how to design an effective toggle button that shows the selected option clearly is a long-term open question among UI/UX designers. In this second part, Eduard Kuric explains a complex list of visual cues used by toggle buttons to communicate which of their options is active.