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)

CustomComboBox {
id: timeZoneBox
width: automaticButton.width + manualButton.width + pluginMain.spacing
height: pluginMain.buttonHeight + pluginMain.spacing // add this to make CustomComboBox to look better even with default display settings

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.