Under the Bid Adjustments → Ad Schedule tab, you will see your active Ad Schedule information, along with your current bid adjustments. You can edit your bid adjustments (1), see when the bid adjustment was last changed (2), the previous bid adjustment value and the ability to assess the impact of this change on your performance by comparing the main metrics before and after the change (3). 

In this section, you can also create new ad schedules across multiple campaigns at once. Click on the Create new ad schedule to define when you want your ads running and if you want any bid adjustments to be applied in certain time periods. 

Note: Among other settings, you can also check if your selected campaigns already have ad schedules in place, and if so, remove unnecessary ones with one click of a button.