The minimum and maximum thumbs on the range slider are used to set the bounds for the currently visible range. Steps define how you move forward or backward through the range slider extent. The thumbs can be moved along the range by either a relative or an explicit step amount you define.
The range step options are available in the Step group on the Range tab. The following two options are available:
- Number of Steps—Use this option if you want to move through the range slider with a specific number of steps regardless of the range extent, for example, if you want to move from the start of the slider to the end of the slider in 30 steps.
- Step Interval—Use this option if you want to specify an exact value to step through the range on the slider (this is the default). Since you can incorporate other settings with this option, it is further explained below.
Step Interval
The range step interval is the value by which the slider thumbs move when you click Play 
, Step Forward 
, or Step Back 
on the range slider, refreshing what data displays at that current range. For example, if you want to visualize the earthquakes by their magnitude data and progress by 1 on the Richter scale, you can specify a step interval of 1, and the slider will step by 1 when you click Play. However, if the step interval is changed to 2, the slider will step by 2, or go from 1 to 3 to 5, and so on.
By default, Use Range Span is enabled for the Step Interval option. This specifies that the value of the step will be equal to the Span of the current range. For example, if the map is currently showing earthquakes with magnitudes between 4 and 6, the step will be equal to 2. This option is useful when you want to ensure that you visualize all data while stepping through the slider. When Use Range Span is unchecked, you can explicitly set it to any given value. For example, if your data naturally falls at specific values, such as building floors, and you have floors starting at 0 (ground) all the way through 10 (top floor), you'll want to set a step interval of 1 so you move to the next or previous floor while stepping.