During the Shift selection step of the Signup workflow, all Shifts that you are able to sign up for will be displayed. You may wish to filter your options based on certain attributes.
There are drop-down filters on the top of the page which let you narrow down the list by any of these fields:
Venues and locations
Date
Time
Roles
Show/Hide Full Shifts
Opportunity or Organization Tags (Use the "More Filters" feature)
You can also choose to hide shifts that are full, shifts you cannot select, and shifts you are already scheduled for. Click the red X icon on the right-hand side to clear any filters that have been applied.