How to remove the emboss effect in a dial?

I've played around with the "No gradient" setting. It is weird. But by reassigning the fill color, I was able to get a plain dial: 

For complete (and less frustrating) customization, though, I suggest inserting a picture of the dial you want. Then select it, and use the Convert to Dial function:

"without using a picture"  are you saying you do not want to use a custom dial?

. . .  you want the provided one to look different?

Hello Ron,

I just want a white circle with a minimum border (flat design). That's it, nothing more ;-)!

Judy's solution may be the ticket.  But if that is not what you want, it is incredibly simple to make anything you want into a dial - https://community.articulate.com/articles/articulate-storyline-360-user-guide-how-to-work-with-dials#custom