Harmony 16 Master Control Slider not showing

Hello,

I was making a test master control, and after all the frames were placed in the right position, and created the controller. The slider is not showing. No dot to move is showing.
I might be doing something wrong since this is my first time trying it.
Please take a look at this video for the explanation.

https://autode.sk/2LzYxxH

By the way, I already checked the show / controls. And that did not do anything. Also, These are simple drawings, they do not have any deformers. (In case they have to), maybe that’s the problem?

You can download the project from here:

https://www.dropbox.com/s/qnu2wt5ua0gliek/Eevee.zip?dl=0

Thank you in advance!