Why can’t I change the Mesh Type from "Tight" to "Full Rect" in Unity?

Unity automatically sets the Mesh Type based on the Trim Mode used in TexturePacker:

• Polygon outline: Creates a polygon shape → Mesh type "Tight" in Unity.
• None: Keeps full rectangular bounds → Mesh type "Full Rect"
• Crop, keep position: Trims transparency but keeps rectangular shape → Mesh type "Full Rect"

To control the mesh type, adjust the trim mode in TexturePacker accordingly.