Change the layout of the printable timesheet page in PWA

[newbie]

Hi all,
I need to change the layout and remove some of the empty lines of the
printable timesheet page.
The page i am refering to is the new window that opens up when you are
viewing your timesheet and click on the "Print" button that is on top of the
grid that contains all the data.

any help is welcome.
thanx