When rotating or scaling a Smart Object in previous versions, you saw "jaggies" (aliasing) until you released the mouse. In 18.0.0, the GPU rendered the transformation live with anti-aliasing.
A new dedicated search tool (Ctrl+F or Cmd+F) allows users to quickly find Photoshop tools, menus, and even Adobe Stock assets without leaving the workspace. Adobe Photoshop CC 2017 v.18.0.0
If your goal is to make the canvas look like actual paper rather than just setting its size: When rotating or scaling a Smart Object in