ActionMenu - Add transparency slider for the menu

[ShaunDreclin]

Title

[dakyneko]

It's not super clear. There is no slider in action menu. Closest I understand is: add option to adjust opacity/transparent action menu through the radial widget.

[ShaunDreclin]

Ahh my bad heh yeah that's what I meant, the vrc action menu has an option to set it's transparency so I'd like that same ability for this menu.