What does the view_label parameter accomplish in LookML?

The view_label parameter is used to change the display name of a view in the field picker, enhancing the user experience by allowing more descriptive or user-friendly names rather than the default view names. This is particularly useful when the underlying view names may not be intuitive for end users, helping them to easily locate and identify the fields they need when constructing queries.

The other choices signify different functionalities. Defining relationships between views is typically handled by the join parameter, which connects views together. Limiting accessible fields is more accurately associated with the fields' access control features, while enforcing query restrictions would be related to setting up certain constraints or conditions for data querying, which is not the function of view_label. By focusing on making view names clearer in the Looker interface, view_label plays a crucial role in improving usability and facilitating better data exploration for users.