Notepad will allow multiple instances to be present. This isn't a huge problem with windows prior to 10 with workspaces, but with windows 10, you get workspaces, and want to edit things on each workspace.
this is a simple fix to the shortcut on launch.
On Windows 10, there is a "pin to start' capability, so the trick is to copy the notepad++ shortcut, rename it, and add the shortcut option to the copy.
option is: -multiInst
Pin that one to the start menu.
- Create a new shortcut to your notepad++.exe
- Go to Properties of the shortcut (Right-click on it)
- Append -multiInst to the target line. It should look like this