Comment 4 for bug 1426117

I can't replicate this on current master. The floating Document Properties dialog seems to be firmly connected to one window, opening a second window with File->New and clicking the opened Document Properties focuses the first window, and changing values there only affects the first window as well.

If you can replicate this behavior in master or a more recent version of Inkscape, feel free to open an issue with http://inkscape.org/report.

Closed by: https://gitlab.com/jhofinger