Printing to scale in Librecad

I have completed a drawing on Librecad and am looking to print it. However, the drawing seems to be filling up the entire page.

I want to have a 1:1 print on paper - This means, I want a 2.5 cm line from the drawing to be translated as 2.5 cm on the paper.

Selecting the scale to be 1:1 doesn't seem to be doing it. I am using A4 paper. Can anyone help me out?

Do you use Print Preview? Don't set "Fit to page". Units set properly in "Current Drawing Preferences"? Page size?
Draw a rectangle in A4 size. If your drawing is meant to be 1:1, and you set this in Print Preview, and set "Center to Page", it should exactly cover the white paper sheet. Stay in Print Preview and click the "Print" icon from there.