Tangents are weighted and free by default in Maya, which means you can adjust the tangents of any key by clicking and dragging on them. They are shown as squares in the Graph Editor Graph view.
When tangents are non-weighted, and locked the appear as triangles in the Graph Editor Graph View.
To change the tangent weight
- In the Graph Editor, right click on the keyframe and select Weighted.
- Next, in the Tangents menu, select Free Tangent Length to ensure that the Tangents are unlocked (free).
