Hi, the planning itself is native but the visual part you describe is not. In BC the plan sits on the Project Planning Lines — type Budget, a resource, dates and quantity. That is what feeds resource availability, so first make sure the resources have capacity defined on Resource Capacity, otherwise the availability figures show nothing useful.
For the overall picture there is the Resource Availability page and the allocated per project matrix, and you can switch the period to day, week or month. It tells you who is over or under booked, but it is a matrix, not a timeline. Moving a task to someone else is just changing the Resource No. on the planning line — works fine, only not by dragging.
A proper Gantt with drag and drop doesn't exist in standard BC, that needs something on top. Analysis mode or Power BI at least covers the reporting side.
Glad to help - follow up if anything is unclear.
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Regards,
Grigorios Mavrogeorgis
Business Central Consultant & AL Developer
Work: Gmsoft Limited
Blog: insidebusinesscentral
LinkedIn: linkedin.com/in/gregorymavrogeorgis