This guide will teach you how to fix Call of Cthulhu rendering at a resolution that is different from what you set in the options menu.

The problem stems from the game not knowing how to properly interpret Windows' scaling settings.

To fix this, you need to locate the game's .exe file found in /steamapps/common/CallOfCthulhu.
Once you have located the file, right-click it, select "Properties" and navigate to the compatibility tab.

From here you need to click on "Change settings for all users", then in the new window that opens click "Change High DPI Settings" and once again a new window opens where you need to enable/tick the box under "High DPI scaling override" and select "Application" from the drop down menu (should be the default).

Then hit OK and in the currently highlighted window press "Apply". Now you can exit all the remaining windows.


You can now start the game and your resolution will be exactly what you specify within the options.