Removing Block Elements
Stackable blocks are composed of multiple smaller blocks. Just as you can add any block inside container blocks such as a Card Block, you can easily remove them as well.
To remove the different components of your blocks, select the specific nested block that you want to remove, click on the 3-dot button on the toolbar, and then select Remove Block.
You can also just simply delete it by pressing the delete or backspace button on your keyboard.