have you checked the Customizer > Typography > Body settings ?
There is the Line Height which is space above and below a line of text.
And there is the Bottom Margin which controls the space between paragraphs.
Thank you for you remind me of that useful info, but I mean that the space between sentence and sentence.
For example, Once I finish writing the paragraph and then press Enter Key, it can make one line of space(Empty). Also, this empty line can make to see them more clearly between paragraph and paragraph.
So I can see this empty line between paragraph and paragraph when I write on draft but It all gone(one line of space by enter key) once update.