SSRS Excel Export. Multi Tab

I have an SSRS report I am exporting to excel. The Export contains multiple tabs as they are grouped by a particular Field!ID and that is how they are named. The last tab appears named as Field!ID.Value (2). Is there a way to name that tab specifically?

I have tried the following but with no luck.

=IIF( Last(Fields!ID.Value) = Fields!ID.Value,"Center Totals",IIF(Parameters!PARM.Value=true,Fields!ID.Value,"All Centers"))