WinUI コントロール
コントロール > Expander

WinUI Expander, as the name suggests, allows you to create an expandable and collapsible information panel that can include text, images, and other controls. The Expander control is a part of Accordion and appears as a header and a blank content panel whose behaviors, such as the expandability, state and the direction, can be modified based on your requirements.

WinUI Expander control in action