comodo help says default enabled so ı think checked > enabled / unchecked > disabled
'' Disable shellcode injection detection
By default, shellcode injection protection is enabled for all applications on your computer. Use this setting to define applications which you do not want to be monitored for shellcode injections. ''
but ıt doesnt give me any alerts how we can test it
If you have a conflict with a certain software, you can add that process to the exceptions list.
Shellcode injection protection is mainly for Comodo self-protection.