Change it from Standard (4:3) to (or Fit to Window/Stretch if you are using an ultrawide monitor and a custom 21:9 patch). Step 3: Launch God of War
Under Graphics Settings > Rendering , turn on Hardware Hacks . Enable Half-Pixel Offset (set to Special or Normal) or use the Align Sprite hack to realign the blur filters cleanly with your new resolution. Taking It Further: Ultra-Widescreen (21:9 and Beyond) God Of War Widescreen Patch Pcsx2
Are you using a or the older 1.6.0 Stable version of PCSX2? Change it from Standard (4:3) to (or Fit