Templates

Click Templates in the editor's top bar and pick one. It replaces the code in the editor; press ⌘Z / Ctrl+Z in the code to undo.

Template	Good for
Flowchart	Processes, decisions, pipelines
Sequence	Requests between people or systems over time
Class	Object models
State	Lifecycles and statuses
Entity relationship	Database schemas
Gantt	Plans and schedules
Pie chart	Proportions
Mind map	Ideas around a central topic
Timeline	Events in order
User journey	Steps and how people feel at each
Git graph	Branching and merging
Quadrant	Two-axis prioritisation

Any custom colour theme you've chosen is kept when you switch templates.