enlarge drawn plan

I took a dsf-file from inkscape and made several adjustments in LibreCad.
Unfortunately I have now noticed that the plan is drawn in the wrong scale. For example the length is 25 cm, but should be 90 cm. Is there a way to correct this without having to draw the whole plan again?
I am drawing a silhouette of a mountain landscape, so it would take a lot of effort to redraw everything again...

thanks in advance for the help.

greets,
   chriz

Easy. Select all, then go to Tools - Modify - Scale, specify reference point, set scale in input box at 90/25, OK.

Ah yes, I see. I am working with the program in a completely new way. Thanks a lot for the help!