Why does my pdf print at 49% scale when I want to print my A0 to a A2?

Please show a screen shot of the Print Dialog when the print is at 49% scale.

Also please say whether the preview in the Print Dialog is right for what comes on paper.

in the future, to find the best place to post your message, use the list here, https://community.adobe.com/

p.s. i don't think the adobe website, and forums in particular, are easy to navigate, so don't spend a lot of time searching that forum list. do your best and we'll move the post if it helps you get responses.

<moved from using the community>