Some apps have this as an internal feature, but is there any way to keep a specific window visible no matter which space you're in?
I figured out how to keep an entire application on any screen.
- Right click the application in the dock
- Mouse-ver Options
- Select All Desktops from the Assign to sub-menu.
But what if I just want, say one spreadsheet in excel to follow me to any desktop, while it keeps the rest where they are?