Remove spacing after paragraph - whole book

I have just compiled my first book written using Scrivener and have uploaded the file to my kindle. The first thing I noticed was how distracting the spacing is. I have left a blank line between every paragraph and have to either remove them all manually or find a method to do this across the whole mauscript (on PC). Is it possible to apply this sort of change to the full manuscript?

Not a Windows user, but the Windows manual says:

So, can you either:

  1. In the project, search for two carriage returns and replace them with one?

OR

  1. During compile, set up a replacement for two carriage returns and replace them with one, so that you only impact the compiled document?

A Windows user might have a better solution…

Moved to Windows support forum. – Katherine