What This Issue Means

From the model configuration, the Simulink editor determines which tabs to display. The editor displays the Real-Time tab for models that are configured for Simulink Real-Time™.

Try This Workaround

To configure your model for Simulink Real-Time, in Simulink Editor, from the Apps tab, click Simulink Real-Time.

This operation changes the code generation target to slrealtime.tlc for the model. After changing the configuration, the Simulink editor displays the Real-Time tab for the model.