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For some users, the NX UI ribbons have a very light colored background and it is visually tiring.
Solution
You can choose a dark gray background for the ribbons by going to File --> Preferences --> User Interface --> Theme-> NX Theme. In the NX Theme section select the Type drop down list and select "Classic" and OK. The ribbons now display in a less tiring gray background.
Notes and References
Hardware/Software Configuration
Platform: INTL64
OS: window
OS Version: 1064
Product: NX
Application: SYSENG
Version: V1847
Function: UI_DESIGN
Ref: 001-7103307