How to set transparent color in figure in Keynote?

In Office 2019 Powerpoint, you can click a figure and define a specific color as transparent. You'd go to Picture Format > Color > Set Transparent Color.

How do I do this in Keynote?

Below is a screenshot from what I do in Powerpoint. I have made the blue transparent.

enter image description here

Thanks in advance


Have you tried selecting the item and clicking the format icon top right? See image below:

enter image description here

And using Opacity...


You might want to use this:

Click Alpha in the toolbar (or choose Format > Instant Alpha) and then select the color...