SD does not recognize a Step option other than the default 0.01 for a Float parameter.
Select an unused portion of the Graph to view INPUT PARAMETERS.
Select Parameters to view the list of exposed parameters for the graph.
Select > for any Float parameter to view the options for that parameter.
Notice the default value, 0.01, for the Step option.
Edit the default value so that it becomes 0.1 or 0.001.
Select the parameter under Preview or Presets.
Select the increase or decrease (step) controls to change the parameter value.
Notice that the parameter is changed in steps of 0.01.
It is inconvenient to scroll through hundredths of a unit of the parameter when tenths are suffient.
It is more inconvenient to have to repeatedly delete and enter hundredth of a unit after 0.99 when changing the Mask Random value for a node with a large Tiling Amount.