Which command is utilized to control the display of a feature based on an expression's value?

The command that controls the display of a feature based on the value of an expression is known as "Suppress by Expression." This command allows users to set specific conditions under which a particular feature will be suppressed or displayed. When the expression evaluates to true, the feature is suppressed, and when it evaluates to false, the feature is displayed. This functionality is particularly useful in managing complex assemblies or working with configurations where certain features may need to be referenced or omitted based on specific parameters, facilitating effective modeling and design workflows.

Other commands like "Hide" typically only toggle the visual representation of a feature without any condition attached to it. "Variable Hide" might imply a more general control without necessarily relying on an expression's value, and "Expression Display" does not exist as a standard command in the context of controlling visibility based on expressions. Therefore, "Suppress by Expression" is specifically designed for this type of scenario in Siemens NX, making it the correct choice for the question.