Dreamweaver doesn't minify scripts. But many web servers do.
GZIP compression reduces file size by up to 70% and is enabled by default on most commercial web hosting plans.
Another possibility, you have the wrong type of line break selected in Preferences > Code Format.
Use CR LF (Win), CR (Mac), LF (Unix).
My host does not have GZIP compression, and my line break is correct... not sure why this is happening. it continues to minify.
Are you using a CSS preprocessor?
nope. default settings. I seemed to happen when CC updated this year.
I can't reproduce it. Sorry.
Try uploading an ordinary CSS file to your server with Filezilla or Cute FTP client.
I use transmit by panic... files upload fine. it's only when I connect to server via Dreamweaver, check out a file and then save.
Just to clairify, you can upload CSS from your local site folder to remote server with Transmit and it's not minified on the server? But when you use the DW file check-in/check-out feature, it becomes minified?
Or perhaps you are using GitHub for version control?
that is correct. pretty much any file I upload from DW file check-in/check-out gets Minified when uploading to remote server.
I am using GitHub for version control - but not in DW. I use the Github desktop app to push and pull. However this is only happening directly from DW to server. I connect via managed site in DW - open the file once connected to remote server. once I upload back to remote server - via saving in DW - code gets minified.
Revisiting Line Breaks for a moment. What kind of platform do your collaborators use (Win/Mac/Unix)?
Is it the same platform as yours?
We're all Mac users.
Check your servers and your collaborator's machines for any extensions that auto minify scripts. Below are just a couple of examples. There are many, many others available.