How to make object type projectile in Project Settings > Collision?
First, navigate to Project Settings → Collision. Then, under the Object Channels tab, click the New Object Channel button.
Then, name your Object Channel. In your case, I’m assuming you’d like it to be Projectile, and set the Default Response, which is the type of collision you’d like the object to have by default.
This method works for creating an Object Channel for any type of object that you like. These are useful because you can specifically set these objects to have their own responses to collision, instead of using something like World Static or World Dynamic.
Let me know if there are any further questions.
Have a great day,