In openhabian-config menu you can change to master tree. Once you are in master tree you have access to more recent developed configuration. For frontail that means the frontail configuration will include a missing css “link”. Having that available the styles / layout of frontail will change.
I have once again reinstalled the OS because the “Upgrade” option from the config always crashed and resulted in an error.
I have now v1.5 of openHABian installed, v1.6-alpha did not quite work for me, it also looked strange, but a bit better.