The Work tab is where work assignments are added to your schedule.
Once you have added shifts and shift assignments either in the form of placeholders or staff assignments on the shift tab the work tab will be available to add work assignments to.
Note: If your shifts are empty (have no placeholder or staff assignment) your work tab will not generate a calendar to add work assignments to.
Related Articles:
How do I add a work assignment to a shift?
How do I copy and paste a work assignment?
How do I copy and paste a group of work assignments?
How do I pin the work assignment grid view to my screen?
How do I change the size of a work assignment on a shift?