Preview Markup Options for Shape Fill Working on a Mac Desktop OS Sierra, want to use Preview to markup a pdf, but need the filled rectangle to be translucent, not opaque.  I only see fill, and no fill options on the menu.  

Is this possible to achieve and what steps might work?
After creating your rectangle you can choose the color picker, then Show Colors. That gives you an opacity slider.

Here you can see I've given it a purple tint.