If you have recently hired more mechanics or you're looking at using the booking diary more, you might want to adjust the number of mechanics displayed in the booking calendar.

In the image below you can see that there are only 4 mechanics displayed per page

You can change this by going to Settings > Company Settings and changing the "Mechanics for Booking Diary" settings.

After increasing that to 6 you can see the booking diary calendar now shows 6 mechanics per page.