Hello, I'm Anabella

Below I attach a few pictures. In the first picture there is a box of objects with a red line, that is the case that we want to make, while in the upper right corner it is the operator that is entering. What happens here is, when the operator is running now not only can he access the case he made himself but a case that someone else made too. Is there a special parameters to sort the case created based solely on the operator that is logged in? if there's any special parameters, can it be adjusted based on access group(picture 2) or workgroup(picture 3)?

Thank You