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In Edit-Displays-Displays under the .Net Client Settings, you will find an Initial Theme textbox. In this field, you can enter whatever theme name you want active for the Project startup. 

Change Theme in Runtime

The Theme selection in Runtime can be done using the syntax below in Script codes, Expression fields, or objects configuration.

To set the project to the default configuration (without themes) , without a custom theme, you need to set the Client.Theme to an empty string (Client.Theme= ””) or create an empty Theme theme table and assign it to the theme property.

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