How to keep legend size after printing

Hi all,

As a mentioned in the title. This issue really annoys me and I would be extremly greatful if somebody help me. What I want to do is change the figure size (via PaperPosition with h = 6.3 and w=8.5 ) and also I would like to maximal minimalize the legend size (box and lines describing the curves) because there is a lot of unnecessary space which causes covering my curves. Before printing, everything looks quite good, but after this the position and the size of legend is changed. Is there anybody how has a simply idea for that problem.

Regards Maciek