When working with large projects in Toad Data Modeler it is important to be able to organize your models. Through the use of categories you can color code your entities so that you can quickly identify and organize your project.
Additional tip: When you assign a category to an Entity, the default state is that Entity has colored only the header. If you want to have the same color for the entire Entity, you can change it in object format, tab shape "Use Brush Color for Full Shape" (Format is in popup menu – right click on Entity or Workspace) (from Petr Daricek)
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