Resizing elements and sections is easy:

Click on any element, and you'll see handles on element borders. Click and hold a handle, choose the direction, and drag it until the element reaches the perfect size:

NOTE: Some elements, e.g., social icons or button elements have additional size settings: click on the element, select Edit and explore the Style settings tab

To resize a section, look for a blue handle on the bottom border of a section and drag it up or down:

NOTE: To resize a blog section or a product section, open its layout settings, and change the top/bottom padding

To resize the website's menu bar, open the header layout settings, and change the top/bottom padding: