Ok, I never used Nvidia Inspector, so I downloaded it, opened it, and at 'Number of GPUs to use on SLI rendering mode' I altered the drop-down to the right of it to 'SLI_GPU_COUNT_TWO' and then right top corner Apply settings...
Ow, and afterwards I found the home icon left top, I selected 'c:\program files\eagle dynamics\dcs world openbeta\run.exe' and saved that profile, since I don't need my system to SLI my desktop:pilotfly: