Thank you all for the response and thank you @namphan for adding an image, it helps!
This that you highlighted is the collection list, not the grid.
What I accidentally deleted was the actual grid (so the products have a grid display)
I added all the products to the collections, but when I open the collections page it doesn´t show any of the products becase there is no grid.
And I was not able to find a way to put the grid back 
Does anyone know how to do this?
Thank you everyone who is willing to take the time to help me