Hello
I understand your concern — this is a common limitation in Odoo.
In standard Odoo (especially Online), there is no single unified calendar view that combines all mentioned things. Each of these belongs to different modules and uses separate models, so they are shown in different views.
→ You can able see the time off inside the calendar. 
Hope this helps
Thanks

Hello Sophie,

Yes, this is possible to a certain extent in Odoo, although the standard Online version does not provide a fully unified “all-in-one” calendar out of the box.

Typically, meetings, activities, tasks, To-Dos, and Time Off are managed in separate modules/views. However, these can often be consolidated through configuration, shared calendar views, or lightweight customization depending on exactly what you want to display together.

For many teams, creating a centralized planning/calendar dashboard significantly improves visibility and avoids duplicate scheduling.

Hope this works for you! If you need any help implementing this or want a more optimized approach, feel free to reach out for further discussion.

Regards,

Zehntech Technologies Inc.

santosh.sekwadia@zehntech.com