multitask
They aren't trying to multitask—their goal in life is to monotask.
I can't say what went on inside their heads once they were forcibly encouraged to monotask.
As we sit down ready to monotask and focus on something important, we're reminded of other ideas.

SMART Vocabulary: related words and phrases

Work, working and the workplace
act as something
all work and no play (makes Jack a dull boy)idiom
assignment
bandh
be at workidiom
grind
hoop
hotelling
housekeeping
in the line of dutyidiom
induction
industry
job
moonlight
slave
slog
slouch
spadework
subtask
sweat