system: opensuse leap 15.0, KDE 18.04.3, plasma 5.13.4, fw 5.49.0, Qt 5.11.1, kernel 4.18.5-1 issue at: kontact 5.8.3, KAddressBook creating a new kontact or editing an existing kontact, location (street, town etc) is not visible in the KAddressBook preview window and therefore not selectable for changes. in the kontact app mainwindow, selecting kontact at the right toolbar and any kontact in the selected adressbook, in the right preview window, location information is displayed.
Fixed in 5.9.0