A family of Microsoft word processing software products for creating web, email, and print documents.
I don't quite follow. You can control inter-paragraph spacing through the two pink-arrow icons in the Ribbon's Hometab. The change will apply to the selected paragraphs, and if there is no selection, only to the current paragraph.
Thus, you can do Edit > Select All (or simply press Command A) and modify the paragraph spacing in the whole document through those two icons. Alternatively, choose Format > Paragraph and specify zero for "Space After."
If you use the Paragraph format dialog box, any parameters that differ for the selection will be shown blank. For instance, if your selection includes text with Single Space and Double Space, that choice will be blank. Likewise, if some paragraphs in the selection have a Space After of 6 points and others have 0 points, there won't be a number in that field.