In the editor, select an element you want to resize. It can be any element - image, text block, video, map, etc.
So, simply click on the element, and choose the direction for resizing. Then, click on the resizing point, and drag it to the perfect size.
That’s how it looks:
If you want to resize the section height, click on this arrow, and drag up or down:
To resize the height of the header section, open its settings and change the padding:
The same goes for the sections in the mobile view: