An element’s properties can be modified in the Properties or Element view.

Changing a class' properties
Keys:
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These are the original properties of the "Training manager" class.
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Let’s start by changing its visibility – click on the field to activate it, click on the arrow on the right of the field to open the drop-down list and select the visibility of your choice.
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Now let’s indicate that the class is a main class by clicking inside the tickbox. A tick appears indicating that the class is now main.