Comment # 3 on bug 1038851 from Michal Srb

A "geometry" option was added to vncmanager 1.0.2. As this is a new feature and
not a bug fix, it won't be backported to existing distributions. It is now in
OpenSUSE Factory, it will get to Tumbleweed relatively soon and it will be in
future (Open)SUSE distributions.

If you want it in Leap 42.2, you can grab yourself a package for example from
here:
https://build.opensuse.org/package/binary/X11:XOrg/vncmanager?arch=x86_64&filename=vncmanager-1.0.2-12.1.x86_64.rpm&repository=openSUSE_Leap_42.2