How to Round Corners
Add a splash of design pizzaz
Turn sharp angles into smooth edges with the rounding corner tool. You can round corners on containers and structures with background colors.
On the side panel, add a background color and then use the plus (+) and minus (-) icons to round the corners. To adjust the font color, click the text and return to the Block level.
It's not possible to round the corners of an image. However, you can round the corners of the background color behind an Image block.
For greater design control, switch on the Separately toggle. Now you can round each individual corner of the structure.