The Toolkit for YNAB‘s Add Pacing to the Budget is an interesting setting. It adds a new column to the right of the Available column. In addition to the default (off) option, you can choose to display the pacing in full dollar amounts, a simple icon indicator, or in the number of days you’re ahead or behind.
What the “pacing” feature is measuring is “how much money you’ve spent based on how far you are through the month.” In other words, your rate of spending in a category relative to where today’s date falls in the month.
No matter which of the three units of measurement you choose, you can click on any displayed value to toggle on or off the emphasis for that category (color or gray) (see screenshots below).