Screenshot black screen tested everything that appears online

[Mangualo]

trying everything that appears online, change compatibility window 8, 7 that uses the integrated. nothing works I come as a last resort since I do not know how to capture the game. any suggestions or help is appreciated desktop pc

 

[deFrisselle]

Please upload a log of a recording or streaming session Otherwise we can't see what OBS is doing when the issue occurs

 

[koala]

You need 2 capture sources for League of Legends, one window capture to capture the lobby and one game capture for capturing the actual gameplay.
Since LoL is a well established game, Google results an abundance of the same solution:

obs league of legends black screen - Google Search