Explanation
The impact of these sharing settings is that Sales Engineers Managers and their managers in the role hierarchy will also have access to these records. This is because sharing rules extend access to users in public groups, roles, or territories. The access granted by a sharing rule is inherited by users above those users in the role hierarchy1. Subordinates of Managers who have Sales Engineers in the public group, Sales Engineers that have a similar role of the Sales Engineers of the public group, and Sales Engineers direct reports will not have access to these records unless they are explicitly granted by other means.