for new files, go to Tools / color management / default settings and choose RGB as default color mode. For previous files, go to Tools / color management / document settiings and choose RGB. The color palette will change automatically to RGB after change the color mode of the document. EDIT: sorry, I didn't notice it was about X4. You don't have both options (default and document settings) only one general setting for all files, also under Tools / color management.
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