Relationships between related/associated tables must be explicitly established in the information schema of your database.
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Code is only generated for database tables with a Primary Key.
Some Razor Pages such as the "List with Grouping", "List with Totals and Grouping", "List with Master Detail (Grid)", "List by Foreign Key", and "List with Master Detail (Sub Grid)" are only generated for tables that have explicit Foreign Key(s).
The "List with Multiple Delete" Razor Page is only generated for database tables with only One primary key.
Some Stored Procedures and/or Linq-to-Entities queries such as the "Select All By a Foreign Key", "Select, Skip, and Take By a Foreign Key", "Get Record Count by Foreign Key", and "Select Drop Down List Data", etc. are only generated for tables that have explicit Foreign Key(s).