How do you attract the attention of a user if you want them to click a button, or look at an ui element like a checkbox?

Question

Let's say you have a side panel that's a bit more complex than this, and you have a button called "Fill in with sample data", "Use recommended filters" or "Use AI-generated filters", and you want the user to notice this option above all else. How would you do this? Should you use a color-scheme, if the color-scheme for the button is not enough, should you add some kind of moving icon next to it. How would you attract the attention of the users? It's supposed to be the most prominent button, and something you want every user to try.

I don't know if the image is a good example, but imagine a side panel with 10 times more button and one that's scrollable.

Answer 1

Highlight it as such. Make it different colour and adjust the contract so it stands out.

Answer 2

Applying Gestalt Principles.

1. Rule of common region: apply different backgrounds for the button and the rest.
2. Rule of proximity: more whitespace around the button to have it separated from the rest.
3. Rule of similarity: different color for the Primary button.

Along with this we need to apply the principles of Visual Hierarchy like higher contrast, saturation and larger size.

As many have pointed out in the comments earlier, the order or position among other objects on that page matters as well. Primary button should be visible persistently so that looking at the page users understand what is the first thing to do.