Corner rounding is only available for button elements.

To round a button’s corners:

  1. Choose the button element on the canvas.
  2. Click the Add border button 1 in the Style panel (if there are no any borders or corner rounding applied to the button)
  3. Set the corner radius in the Border radius 2 field by clicking the “+” or “****” buttons or typing the specific radius.

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You can remove rounding in two ways: