Open the section Settings in the Workbench.
Scroll to the section Customize Theme.
Under Primary Color, enter the main color theme (hex format, e.g. #00204A) : #00204A).
Add a Secondary color (hex format, e.g. #FF8C5F) : #FF8C5F).
Add a Background color (hex format, e.g.: #16FFBE; default: white = #FFFFF).
Workbench:
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Questionnaire:
