Timetag gives you the option to choose between having calendar settings of either singlular or multi-use. But what's the difference?
Singular: The calendar is dedicated for a single purpose, which is for Timetag entries. Every entry in the calendar will be picked up by the system and therefore if an entry is made without a tag (#), it will automatically become a faulty entry. This is a great option for when your calendar is specifically dedicated for only Timetag entries.
Multi-use: The calendar can be used for multiple purposes. For instance, you can add personal entries as well. Only entries with a tag (#) will be pushed into Timetag. This is a great option if you have a calendar that you like to use for a variety of events.
Having trouble finding this option? Read: How to choose between single and multi-use calendar