How to make the blue shapes in Keynote go away

Create a standard shape

The styles are not just on the object but also in the Shape Stye on the upper left of the style panel

Style your new defaults on the example shape

Right click on the blue panel in the style tab and chose Redefine style from selection

This popup will appear ¯\_(ツ)_/¯

Shape Style and shape should look the same.

Enjoy :)

Delete the example shape but do not close the deck yet, it's getting better...

How to make them go away FOREVER!

Save the untitled deck with name Standard-new.key to the desktop

Find Keynote in the Applications folder, right click and chose Show Package Contents

Navigate to Contents / Shared Support / Templates

We're looking for the folder White in which there is a file called Standard.kth

Move (not copy) it out of the folder to the desktop by holding the CMD key while dragging. You will need to enter your password.

Rename it to Standard-old.kth (requires password)

Now rename Standard-new.key to Standard.kth...

...and move it into the folder White (requires password)

Open your new White Standard template...

...enjoy :)