What option appears next to the custom view icon on the toolbar?

The grid icon appears next to the custom view icon on the toolbar, serving a specific function in the FortiAnalyzer interface. This icon represents the grid view layout, enabling users to organize and display their data in a structured, easily readable format. Utilizing the grid view allows users to have a clear overview of the information being analyzed, enhancing their ability to interpret data quickly and make informed decisions.

In the context of FortiAnalyzer, this is critical since users often need to switch between different data presentation formats to extract insights effectively. The other icons, while useful in their own contexts, do not specifically represent the grid view functionality that is associated with the custom view icon. Thus, the grid icon is the correct answer due to its direct correlation with how users choose to visualize and interact with their custom views in the FortiAnalyzer environment.