Chrome Version: 70.0.3538.77 (Official Build) (64-bit)
OS: Debian GNU/Linux rodete (upgraded from: Ubuntu 14.04.5 LTS)

What steps will reproduce the problem?
(1) Download an SVG (e.g. https://publicdomainvectors.org/en/free-clipart/Dragon-Stencil-Art/52606.html )
(2) Open print dialog, click "More settings"
(3) Attempt to change scale

What is the expected result?
Image would change size (i.e. would take up less of the page, or multiple pages, depending on scale chosen)

What happens instead?
Image size remains fixed.

I understand that SVGs do not have a "real" size because they can be scaled to arbitrary sizes. However, Chrome clearly assumes by default that they should take up a full page when printed (presumably at the default zoom level of 100%), which seems as reasonable as anything else. Having established that 100% = full page, you should then be able to adjust the zoom to take up more or less space.