# 09E Vocabulary in Context

The navigator helps visitors move between sections, and the preferences panel lets them enable the features they need.
The user can replay the recording, download the text, or submit an answer before moving to the next exercise.
The user can scroll through the list, click a tab, and select the next unit before starting the exercise.
Clicking the icon should not collapse the panel unless the control is explicitly labeled as collapsible.
The application can switch modes, but it should explain the current mode before the user enters a command.
A toast confirms the save action, while a more serious warning stays visible until the person has read it.
The selected option is marked with a clear indicator, and the secondary action appears below it.
The selector changes the active category, while the handlers respond to the specific events raised by each control.
A timeout should lead to a clear retry option instead of leaving the interface in a state that looks permanently busy.
The user can exit the exercise and return to the same position without creating duplicate entries.
The navigation guide shows the available directions and the path back to the previous part of the workflow.