Locate the community-vetted Sleeping Dogs Widescreen Fix (typically hosted on GitHub via trusted developers like ThirteenAG or via the PCGamingWiki community links). Ensure you download the version corresponding to your game edition (Original or Definitive Edition).
If your UI elements disappear off the edges of your screen, ensure that you have enabled the "Fix HUD" or "Aspect Ratio Lock" checkboxes in your fixing utility. If you are using multi-monitor setups (like AMD Eyefinity or NVIDIA Surround), you may need to force the HUD to constrain to a 16:9 center box via the game's internal setup files. Screen Flickering or Black Screens sleeping dogs widescreen fix