When you rearrange elements inside the blocks, they are resized automatically. This helps preserve the professionally polished look and feel of your site.
For example, when you delete one of the elements in the block, the rest will rearrange automatically, preserving the margins and spaces between them. For example, you delete one block element:
When you Duplicate one block element (or make more than one duplicate), the result would be proportionally laid out:
That's how you can resize your blocks.
Note: You can instantly change the layout of your blocks by going to Block Settings and previewing block variations in Layout tab.