HabPanel - Where to Start?

Thanks
I verified that the link https://home.myopenhab.org/habpanel/index.html works
Note: the link works from the desktop (Ubutnu 16.04) via regular web browsers (Firefox, Chrome). In an Android phone (Nexus 6P Android 7.1.2) it works via the Chrome web browser, but not from the android openhab app (version 1.8.0.7)

So if I play with the configuration and later want to restore it to a known xml reference file, where would this xml file location be? (the reason I’m asking is that I want to set my habpanel configuration by importing a textual (e.g. json, xml) reference file and make changes by directly editing the file instead of interacting through the GUI)