Please add Transparency as an option to the Format All Symbols menu. When you have many unique values to symbolize, it's a lot of clicks to go into each one and alter the transparency slider, especially when you're just using a default color scheme. Currently, if you try to Format All Symbols and change the fill transparency to something, it changes all the values to the same color. If you then try to apply a color scheme (ramp) over it, the transparency is gone.
The Transparency slider in the Appearance tab makes the outline transparent too, which isn't what I want. So it might be best if there are separate options for fill transparency and outline transparency on the Format All Symbols menu.
As of Pro 2.8.3