Click Setup in the top bar (or the ▶ Setup bar above the grid) to expand your timetable settings. Changes only take effect when you click Apply Setup - so feel free to experiment without affecting the grid.
These cells are clickable too. Click any shaded break row to add a one-off note such as Assembly or Fire Drill - you can apply it to just that day, all days this week, or both weeks at once.
Click any filled lesson to edit it. The Room override field lets you set a different room for that specific slot (e.g. Hall instead of R14) without changing the class's default room everywhere else.
When editing a slot you can choose to apply the note and room to this slot only, all lessons of that class this week, or all lessons across both weeks - handy for setting a permanent room change or a recurring note.
With a fortnightly timetable, use the Side by Side or Stacked toggle in the top bar to see both weeks simultaneously - useful for spotting clashes or printing both at once.
Export downloads a .json backup of everything. Import restores it - useful for moving between computers or sharing with a colleague.