Where is the "insertion condition" when creating a custom GUI?

I want to make my GUI be connectable with hoppers, so that they work as intended.
The problem is that the hopper will fill in slots that are restricted by a tag i set (see in the image).

The solution to that problem would be what is stated in the small text at the bottom of the image, but i dont know where to find that option or how to prevent it in another way.
Please help :/

https://drive.google.com/file/d/1XhbNbcOXJdkh16lLknZIyOULOakPMNLh/view?…