There are several reply already telling you how to do this, but I should
add - Are you sure you really want to? Since the calendar controls the
scheduling of tasks and tasks usually are proken down to the level of the
work done by one person or a team of individuals, showing all 7 days as
workingg days implies that once a task starts, people will work on it every
day, no days off at all, until it' done. Before setting up your calendar as
7 days you should make sure that really describes what's going to happen
with your tasks. If there's a task that takes 2 weeks to do, will it be
worked on every day for 2 weeks without the people working on it taking any
days off?