Combine up to 3 shape keys in one place, displaying each value. The advantage of this being you can group related shape keys together, allowing for improved management and simplified control over your mesh. Imagine, for example, you have two eyebrows, left would be shape key 1, right: 2, and both eyebrows together: shape key 3. Your shape keys are now synergized for operational effectiveness.
Category: Shape Key management
Software: Blender 2.83, 2.93, 3.x