Can I get output log in game built in development mode?

I have send game to my friend for testing. He has game in development mode. How can he turn the output log on?

The log should work compiled in Development mode.

Shipping mode it should not. But here is how to turn it on:

How to add “bUseLoggingInShipping” to my Project? - Unreal Engine Forums

Ok, how to show it in development mode?

Right click on the .exe, create a shortcut, open it’s properties and write -log at the end of the “Target:” field. This is a command line argument that tells the engine to open an additional log window. I usually use these arguments when testing multiplayer projects:

-log -windowed -ResX=1280 -ResY=720