Filtering a View using the Assignee field from Gravity Flow
If you wish to only display entries on your View where the Assignee field is equal to the currently logged-in user, then you must use this expression on your Advanced Filter logic:
About the Assignee field
According to Gravity Flow's documentation:
The Assignee Field is an advanced workflow field that can be added to a Gravity Form and can be used to allow users to choose between Users, Roles and other Assignee fields.