Qt Launcher - Settings - Display - Reset to default - default values are incorrect at least for 1280x720 displays used with Toradex iMx6 and iMx8.
Setting values to default i.e. physicalScreenHeightMm = 90 and physicalScreenWidthMm = 154 lead a bit weird looking UI items (see custom_combo_box_dt.png). UI items as such e.g. CustomComboBox used in Qt Launcher - Settings - Date & Time and Qt Launcher - Settings - Network could be fixed separately e.g. with below code change to look like (custom_combo_box_dt2.png)
But actually the proper solution would be perhaps to change the physical screen size default values to something meaningful, perhaps something that is read from each device configuration.