What can be done if developers are only able to access the default library in Qlik Sense?

Configuring security rules for new libraries is a correct and effective approach to address the situation where developers are only able to access the default library in Qlik Sense. By establishing appropriate security rules, administrators can control access to various resources within Qlik Sense, including specific libraries. This allows developers to gain access to additional libraries that may be created, ensuring they have the necessary resources to perform their work effectively.

Security rules can be tailored to define who can access what, and when they can do so, thereby providing a flexible and secure framework for resource management. By implementing these rules, administrators can ensure that developers have access to all required libraries, facilitating better collaboration and development efforts.

The other options do not directly address the issue of access to libraries. Disabling the default library would be counterproductive, as it serves as a fundamental resource. Increasing network bandwidth is unrelated to the issue of library access and would not impact permissions or access control. Rebooting all development nodes would not solve the underlying access issues, as this action does not change permissions or security configurations for libraries.