How to get rid of block style, space b/w paragraphs

I was writing in a traditional Word style with paragraph indents and no spaces between paragraphs, but I did some pasting and now it’s on a block style with spaces between paragraphs — not good for a novel. Apparently this is the preset — I went back and hit a default button somewhere.

How can I get all my documents and projects to default to a traditional, Word type paragraph with a five space indent and no lines between paragraphs?

Thanks
Melanie

Here is an article written to address this topic.

THANK YOU SO MUCH!!!