In-house is different. Lawyers who leave behind the single, private offices of law firms are greeted to open floor plans, rows of desks and a lack of walls and privacy at their corporate employers’ headquarters. But the lawyers say they love it. It’s easier to collaborate, get answers to legal questions and just be social in the popular Silicon Valley layout, said in-house attorneys at Lyft Inc., Pinterest Inc., Facebook Inc. and SurveyMonkey Inc.