To change paragraph spacing in Squarespace, you can follow these.
#1. Click the Site Styles icon
#2. Click FONTS
#3. Click Paragraphs
#4. You can adjust Line Height and Letter Spacing
#5. Note: Many elements inherit style from Paragraph, so when you change these two options, it will also affect many other elements. To check which elements inherit styles from Paragraph to change them, you can follow these.
Click Assign Styles
You will see all elements inherit styles from Paragraph. You can click on each option to change them.
For example, to change Site Navigation, click the arrow
you can choose Custom, and enter your custom own option