How do I change the style of product's quantity selector?

I want to change this quantity selector
From this:

to this:

Thanks in advance!

  1. Go to the theme editor.
  2. In the theme preview, click on a product.
  3. Then, click on the Product pages tab.
  4. You will see a menu with the option Show quantity selector, so click on that checkbox.
  5. Save your changes.

Hi! Thanks for replying.
I can’t seem to follow your instructions @smith_tech .
Would you mind sharing a screenshot of the ‘menu with the option Show quantity selector’?
I’d greatly appreciate that! Thanks!

@ClarissaG - please go to online store->open customize settings->open product page in those settings and check i0f you have an option to change quantity selector

Thank you @suyash1

I just ticked this checkbox off in the product page of the page editor.