How do I do enemy's who shoot on sight?

so am making a platformer game like megaman (in gameplay) but how would i make it so when a enemy sprite is facing to the left he dosent start shooting the player who is at the right of him

The Behavior you're looking for is Line of Sight: I've attached an example of sprites that use it.

The Behavior you're looking for is Line of Sight: I've attached an example of sprites that use it.

i cant open your file it says its on a older copy of construct 2 as am on 19.5 and that copy 19.2

but i tryed los and when i am behind him he can see me

Jenssons Line Of Sight is a behavior with multiple attributes. Obstacles, Range, Collisions, and Cone of view.

You have to set Cone of View to less than 180 for it not to be able to see behind itself, and I would recommend 90.

Also, I'm using the most recent edition of Construct 2: 196.2; you're using stable release 195, which is the older copy. You won't have a lot of luck opening .capx files on this forum unless you're willing to update to the beta releases. https://www.scirra.com/construct2/releases