I forgot to mention: the version on Flathub seems to be 100% the same as the one provided on the Sweet Home website and the behaviour is identical -- including the need to launch the application twice.
There's another ticket #1155 where there's the OPPOSITE problem. Maybe it's related? What exactly did you try to do in that .ini file?
There's another ticket #1155 where there's the OPPOSITE problem. Maybe it's related? What exactly did you try to do in that .ini file?
Three years later, I am having the same problem on Elementary OS 8.1 (based on Ubuntu 24.04, Linux kernel 6.17.0). I am using the newest version of SH3D from Flathub, ie 7.5 with the included Java version 1.8.0_202. I tried fiddling with -Dsun.java2d.dpiaware, -Dsun.java2d.uiScale and -Dcom.eteks.sweethome3d.resolutionScale, but I could only change the UI as a whole, not just the font size. Another problem I have, and I don't know if this is related in any way, is that I have to start SH3D TWICE...
Auto save after every change does not actually auto save