Remove the Multi-Value List for the Mass parameter
The last step is to modify the User parameter called mass. It is currently a Multi-value parameter. We can remove the Multivalue list associated with this parameter by editing the multi-value list.
Right-click an empty cell in the mass row and select Edit Multi-Value List from the context menu.
Select all of the values in the “Value” list, and then click the Delete Selected Items button.

Click OK to accept the change. Notice that the mass parameter no longer has a multi value list to select from.
Test the modified rule
In the Parameter Editor, enter a mass value of 75. The width of the bracket is set to 1 inch.
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