hot-desking 
noun [mass noun]
The practice in an office of allocating desks to workers when they are required or on a rota system, rather than giving each worker their own desk.But this tradition is breaking down, due to practices such as hot-desking, business travel and tele-commuting....
- The modern preference for hot-desking in open-plan offices also gets a cool reception from workers.
- We keep a number of desks free for hot-desking, so I use one of those.