He goes into attack 'mode' [=he becomes very hostile and aggressive] whenever his decisions are questioned.
We're changing the factory's 'mode' [='method'] 'of' operation in order to save money.
When I'm in my creative 'mode' [=when I'm feeling creative], I can write for hours.
(..) and gentlemen, boys and girls, friends and enemies, meet the future! The future what? The future mode of transportation for this weary Western world. Now, I'm not going to make a lot of extravagant claims. (..)1969 Butch Cassidy and the Sundance Kid