The in-game graphics settings for Sleeping Dogs appear to be rather simplistic:
The "Fullscreen" option toggles whether the game is fullscreen or shown in a window with a border around it. Is it possible to play Sleeping Dogs in a borderless window mode?
Best Answer
You can use WindowedBorderlessGaming (name unconfirmed) to force Sleeping Dogs into borderless windowed mode. It has been tested successfully for Sleeping Dogs on Windows 7. This is also the method suggeted on PCGamingWiki.
Instructions from the post on Steam forums: