The Properties tool window displays the properties of the currently-selected Objects at any given time. This makes it easy to browse and change properties.

You can select multiple objects and change the properties for all of them in a single step.
The property list can be filtered using the 'Filter' text box. You can also use this text box to set a property quickly, by typing something like MainProgram=True. GeneXus will auto-complete the name of the property and suggest valid names:

When a property is required but has not been set, a yellow warning symbol is displayed next to it:

When a property is modifed, a green bar is displayed next to it:

You can reset a property to its default value by right-clicking on it and selecting "Use Default":

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