This guide shows you how to enable a red visual square around your `Mouseareas` and `MultiPointTouchArea` controls. It visualizes where you can click/touch and also shows any overlapping touch area's. It's helpful on full screen device interfaces like a coffee-machine or other HMI. The environment flag `QML_VISUAL_TOUCH_DEBUGGING` needs to be set, but this is not documented on the Qt Docs site, only on a cheat sheet from 2016 by ISC. If you google for the environment flag, the only pages you ...