When you click the divider to resize the display diagram in the Display Settings Module, the diagram disappears and is impossible to recover. One must close and re-open the Display Settings Module. KDE Plasma Version: 5.12.0 KDE Frameworks Version: 5.42.0 Qt Version: 5.9.3 Kernel Version 4.13.0-32-generic OS Type: 64-bit
Created attachment 110453 [details] Window before clicking divider, mouse cursor is shown for specificity
Created attachment 110454 [details] Window after clicking divider
This is resolved for me on latest master branch.