From the .settings file:
// When drag_text is enabled, clicking on selected text will begin a
// drag-drop operation. This is not currently implemented under Linux.
"drag_text": true,
Why is it not implemented? Its absence irritates. The linux editor Xed (based on gedit) can do it, so why can’t Sublime? (I’m using Sublime 3, development version - on Linux and Windows. Or Windows, the operation works fine).