In paint modes, show a selector for the active canvas, similar to how other editors (UV/Image, Nodes, Action) do it. Available canvas in each mode: * Weight Paint: Vertex Groups * Vertex Paint: Color Attributes * Texture Paint: Canvas (material, image) * Sculpt Paint: Color Attributes, canvas in experimental sculpt paint) Pull Request: https://projects.blender.org/blender/blender/pulls/111756