Navigate to your DentalCADApp, open the config folder, make a copy of the defaultparameters XML file as backup in case something goes south, open the defaultparameters XML file, play with these settings to your liking
<Parameter>
<Type>FreeformBrushSize</Type>
<Value>2</Value>
<MinValue>0.25</MinValue>
<MaxValue>8</MaxValue>
</Parameter>
<Parameter>
<Type>FreeformStrength</Type>
<Value>0.5</Value>
<MinValue>0.01</MinValue>
<MaxValue>2</MaxValue>
</Parameter>
<Parameter>
<Type>OverpressCutoff</Type>
<Value>15.0</Value>
</Parameter>