Print using system Dialog on zorin

I am using Libreoffice 25.2.2.2 on Zorin 17.3. I am trying to print to custom size paper and to do this I need to get to the system print dialog. The standard print dialog does not allow me to select the odd paper size for the printer, so I get a miss match error. The system dialog lets me access the custom paper size.
I cannot find away of forcing libreoffice to let me acces to system dialog for printing.
Can any body help?


May be the button Properties (under the printer Name) ?

Thanks for trying but that doesn’t work: back to standard sizes.