I am facing problem while exporting LibreOffice calc file into PDF. I want it to be in single sheet 1 page but its becoming 2 pages.
Are you sure that your Document consists only of 1 page ? That happend to me a few times. Another posibillity is the opening "export as PDF" dialog gives you the posibillity to define the Range you want to export.
You could try to set Pages to 1 there.