What do the colors on the time bar mean?

There are three color parameters in the settings of the rule:

Select a сolor of partially reserved time to be closer to the color of available time. As a result, if there is at least one place left, the time bar will not look like it is fully reserved. In the picture, there is 1 place left in the interval from 5:00 AM to 10:00 AM. And there are no places left in the interval from 10:00 AM to 1:00 PM.

If you do not want to indicate partially reserved time, then choose its color to be the same as the color of available time.