Class unavailable periods

You can mark specific time slots during which a class should not have lessons. These restrictions are set on the class settings page.

Go to Classes and click the edit icon next to a class. The unavailability table is shown at the bottom of the page.

Two types of markers

The table has two marker tools:

Block (Strict) — shown in red. The scheduler will never place a lesson in this slot. Use this for slots that are genuinely impossible — for example, a class that attends a fixed school event every Tuesday at 10:00.

Avoid (Flexible) — shown in yellow. The scheduler will try to avoid this slot but may use it if there is no other option. Use this for preferences rather than hard requirements — for example, you'd prefer not to schedule lessons on Friday afternoon.

How to mark slots

1. Select a marker tool: Block (Strict) or Avoid (Flexible).
2. Click on individual cells in the table, or click and drag to mark multiple slots at once.
3. Click on a day label (row header) to mark the entire day.
4. Click on a time slot label (column header) to mark that time across all days.
5. Click Save to apply the changes.

To remove a marker, select the same tool and click the marked cell again, or use Reset all to clear the entire table.

Recommendation

Use Avoid (Flexible) wherever possible. Too many strict blocks can make the timetable impossible to generate. A warning appears if more than 50% of time slots are marked as unavailable.

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