How to show parameters panel in xtrareport

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DevExpress

hi,
i use devexpress XtraReport,
when i set this settings :

 PaperKind = A4;
RollPaper = false;

the parameters button disabled and parameters panel disappeared.

how to use (parameters panel) and (PaperKind = A4) together .

thanks

What I have tried:

i tried to turn on RollPaper option but it make problems with a4 paper ( only one page was printed).