This has been an ongoing issue for me. I use Word and Evernote in my everyday work and frequently copy things from my Word documents into Evernote. My settings for Word for paragraph options are always "single" line spacing, with 0 pt before and after. I'll add spacing, if I want it, with the "Enter" key. Otherwise, I don't want it.
When I paste anything from my Word documents into an Evernote, Evernote adds double spacing to all of it. Years ago, I reached out to Evernote support for help and they said it was a known issue, but in the meantime I can choose to "Simplify Format