By default Slider controls range from 0 to 100, however it can be given custom min and max values.
In order to change the value range:
Right-click on the slider in the effects panel and click “Edit Value...”.
In the ensuing dialog, change the “Slider Range” values to your desired range. The number on the left defines the minimum and the one on the right defines the maximum slider value.
When set click “OK”.
In the example below the min value is set to -50 and max to 50.
Screenshots
2. Custom Unit
By default the sliders will be interpreted as a percentage (%). If needed, a custom unit can be set for the slider, e.g. px.
In order to change the unit, simply simply rename the control to something like NAME [UNIT], where [UNIT] represents your desired unit. For example: Width [px]
Alternatively, you can change the slider unit using the