Forcing label placement to be always inside polygon using QGIS?

Question

How do I force a label to be ALWAYS INSIDE a polygon with placement method "Using perimeter (curved)"?

I experimented with "Left of line", "Right of line", but some labels are still placed outside the polygon.

Answer 1

You can go to the label rendering pan and check the box "only draw labels that fits completely within feature"

Also make sure that the placement allows labels above and below line.