Decrease Paragraph Spacing

Hey guys, your help will be much appreciated.

How do i decrease the space between paragraphs? At the end of a paragraph before the next sub heading, just one space is too small, but if i put two spaces (hit enter x 2) then the gap is too big.

My site is https://pyxism-review.com

I’m using flexsqueeze theme 1.4

Thanks for you help