Here is a list of all documented struct and union fields with links to the struct/union documentation for each field:

### - u -

- UnfocusFocusedWidget() : Window
- uninit_read : SaveLoadFormat
- uninit_write : SaveLoadFormat
- units : LocaleSettings
- units_volume : CargoSpec
- unshaded_size : Window
- UnshareOrders() : AIOrder
- UpdateListPosition() : NewGRFAddWindow
- UpdateOrderTimetable() : OrderList
- UpdatePosition() : ViewportSign , Scrollbar
- UpdateSpeed() : Train
- UpdateViewportCoordinates() : NWidgetViewport
- UpdateVirtCoord() : BaseStation , Station
- UpdateWidgetSize() : BuildTreesWindow , OrdersWindow , NewsWindow , VehicleDetailsWindow , AIListWindow , QueryWindow , QueryStringWindow , TooltipsWindow , ErrmsgWindow , IndustryDirectoryWindow , BuildIndustryWindow , NewGRFAddWindow , NewGRFWindow , SelectCompanyManagerFaceWindow , SelectCompanyLiveryWindow , CompanyFinancesWindow , TownDirectoryWindow , AIDebugWindow , AISettingsWindow , AIConfigWindow , CompanyStationsWindow , TownAuthorityWindow , Window , VehicleViewWindow , SetDateWindow , VehicleListWindow , RefitWindow , ReplaceVehicleWindow , StationViewWindow , SelectStationWindow< T > , CompanyWindow
- use_left_mouse_button : TooltipsWindow
- used : AILog::LogData
- used_set : BaseMedia< Tbase_set >
- UsePaletteAnimation() : Blitter