When I publish the report in Power BI service , I see the grey space to the left and right of the report as shown in fig below.Is there anyway to remove those so that it occupies whole page?
I don't get any context from the image you posted. In the Service you can choose View | Fit to Page or View | Fit to Width or View | Actual Size. Have you tried all of these options?
Proud to be a Datanaut!