By default, Support Workers (and other types of users) can only see and edit their own schedule.
To allow a user to view the full schedule (including other people's shifts):
Go to each User Profile > Permissions section.
Click Menu Items to display settings.
Click the Edit button.
In the Schedule settings, turn on the first 3 switches. This may require turning the first switch off to be able to turn on the second switch.
Click Save.
This user will now be able to change the filter in their schedule to 'All Users' which allows them to see other people's shifts.
