how can I do the Transparent in the shapes?
 

I try to draw two ellipse, and I used shapes tool to draw them. One is red and another is blue. And I wanna let the blue one cover a part of the red one (pls see attached diagram), I hope I can adjust the blue one's transparent and make the mix part show another color, but I can't find this function.

Anyone can heplp me?

Thanks a lot

In the color pallette at the bottom is an opacity slider. It does what you want (if I correct understand what you want).

Many Thanks
 

I got it and looks very good.

Thanks a lot