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The Theme Editor is an application that you can use to create a new theme by setting colors, fonts, images, and use constant expressions in a theme and then saving a new theme as an .rdlx-theme file on your local machine.
You can run the application by selecting the ActiveReports 19 Theme Editor from the Start menu, or by running the ActiveReports.ThemeEditor.exe from the C:\Program Files (x86)\MESCIUS\ActiveReports 19\Tools\ location.