Previously you needed to install the Color Scheme Editor from a separate installer, and the dialog box was not available from within Inventor. With Inventor 2019, the Color Scheme Editor is installed with Inventor and access to the Color Scheme Editor is available directly from the Application Options/Color tab. Click Customize Schemes to open the Color Scheme Editor and create your own custom color schemes. In addition, the Color Scheme Editor is enhanced as follows:
For more information, see To Customize Color Scheme.