How do I decrease the size of my RDL parameter box?

See more:

SSRS-2008

I have a report that has a parameter and that parameter defaults to 1.

The size of the box that displays that defaulted parameter is very long. It has been requested that I decrease the size of this parameter box.

Everything I have found online applies to text boxes and not the actual parameter boxes that display on a report when the report is created.

I also checked the RDL code thinking there was a field size that I could adjust but there isn't.

Is there a way to do that like we can decrease the size of regular text boxes?

What I have tried:

Google search, different blogs and technical sites.