diff --git a/src/object_gui.cpp b/src/object_gui.cpp
--- a/src/object_gui.cpp
+++ b/src/object_gui.cpp
@@ -690,11 +690,9 @@ static const NWidgetPart _nested_build_o
 					NWidget(WWT_TEXT, COLOUR_DARK_GREEN, WID_BO_OBJECT_SIZE), SetDataTip(STR_OBJECT_BUILD_SIZE, STR_NULL), SetAlignment(SA_CENTER),
 				EndContainer(),
 				NWidget(WWT_PANEL, COLOUR_DARK_GREEN), SetScrollbar(WID_BO_SELECT_SCROLL),
-					NWidget(NWID_HORIZONTAL),
-						NWidget(NWID_MATRIX, COLOUR_DARK_GREEN, WID_BO_SELECT_MATRIX), SetPIP(0, 2, 0),
-							NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BO_SELECT_IMAGE), SetMinimalSize(66, 60), SetDataTip(0x0, STR_OBJECT_BUILD_TOOLTIP),
-									SetFill(0, 0), SetResize(0, 0), SetScrollbar(WID_BO_SELECT_SCROLL),
-							EndContainer(),
+					NWidget(NWID_MATRIX, COLOUR_DARK_GREEN, WID_BO_SELECT_MATRIX), SetPIP(0, 2, 0),
+						NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BO_SELECT_IMAGE), SetMinimalSize(66, 60), SetDataTip(0x0, STR_OBJECT_BUILD_TOOLTIP),
+								SetFill(0, 0), SetResize(0, 0), SetScrollbar(WID_BO_SELECT_SCROLL),
 						EndContainer(),
 					EndContainer(),
 				EndContainer(),
diff --git a/src/rail_gui.cpp b/src/rail_gui.cpp
--- a/src/rail_gui.cpp
+++ b/src/rail_gui.cpp
@@ -1595,11 +1595,9 @@ static const NWidgetPart _nested_station
 					NWidget(NWID_SELECTION, INVALID_COLOUR, WID_BRAS_SHOW_NEWST_MATRIX),
 						/* We need an additional background for the matrix, as the matrix cannot handle the scrollbar due to not being an NWidgetCore. */
 						NWidget(WWT_PANEL, COLOUR_DARK_GREEN), SetScrollbar(WID_BRAS_MATRIX_SCROLL),
-							NWidget(NWID_HORIZONTAL),
-								NWidget(NWID_MATRIX, COLOUR_DARK_GREEN, WID_BRAS_MATRIX), SetPIP(0, 2, 0),
-									NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BRAS_IMAGE), SetMinimalSize(66, 60),
-											SetFill(0, 0), SetResize(0, 0), SetDataTip(0x0, STR_STATION_BUILD_STATION_TYPE_TOOLTIP), SetScrollbar(WID_BRAS_MATRIX_SCROLL),
-									EndContainer(),
+							NWidget(NWID_MATRIX, COLOUR_DARK_GREEN, WID_BRAS_MATRIX), SetPIP(0, 2, 0),
+								NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BRAS_IMAGE), SetMinimalSize(66, 60),
+										SetFill(0, 0), SetResize(0, 0), SetDataTip(0x0, STR_STATION_BUILD_STATION_TYPE_TOOLTIP), SetScrollbar(WID_BRAS_MATRIX_SCROLL),
 								EndContainer(),
 							EndContainer(),
 						EndContainer(),
diff --git a/src/road_gui.cpp b/src/road_gui.cpp
--- a/src/road_gui.cpp
+++ b/src/road_gui.cpp
@@ -1656,11 +1656,9 @@ static const NWidgetPart _nested_road_st
 					NWidget(NWID_SELECTION, INVALID_COLOUR, WID_BROS_SHOW_NEWST_MATRIX),
 						/* Hidden panel as NWID_MATRIX does not support SetScrollbar() */
 						NWidget(WWT_PANEL, COLOUR_DARK_GREEN), SetScrollbar(WID_BROS_MATRIX_SCROLL),
-							NWidget(NWID_HORIZONTAL),
-								NWidget(NWID_MATRIX, COLOUR_DARK_GREEN, WID_BROS_MATRIX), SetPIP(0, 2, 0),
-									NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BROS_IMAGE), SetMinimalSize(66, 60),
-											SetFill(0, 0), SetResize(0, 0), SetDataTip(0x0, STR_STATION_BUILD_STATION_TYPE_TOOLTIP), SetScrollbar(WID_BROS_MATRIX_SCROLL),
-									EndContainer(),
+							NWidget(NWID_MATRIX, COLOUR_DARK_GREEN, WID_BROS_MATRIX), SetPIP(0, 2, 0),
+								NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BROS_IMAGE), SetMinimalSize(66, 60),
+										SetFill(0, 0), SetResize(0, 0), SetDataTip(0x0, STR_STATION_BUILD_STATION_TYPE_TOOLTIP), SetScrollbar(WID_BROS_MATRIX_SCROLL),
 								EndContainer(),
 							EndContainer(),
 						EndContainer(),
@@ -1735,11 +1733,9 @@ static const NWidgetPart _nested_tram_st
 					NWidget(NWID_SELECTION, INVALID_COLOUR, WID_BROS_SHOW_NEWST_MATRIX),
 						/* Hidden panel as NWID_MATRIX does not support SetScrollbar() */
 						NWidget(WWT_PANEL, COLOUR_DARK_GREEN), SetScrollbar(WID_BROS_MATRIX_SCROLL),
-							NWidget(NWID_HORIZONTAL),
-								NWidget(NWID_MATRIX, COLOUR_DARK_GREEN, WID_BROS_MATRIX), SetPIP(0, 2, 0),
-									NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BROS_IMAGE), SetMinimalSize(66, 60),
-											SetFill(0, 0), SetResize(0, 0), SetDataTip(0x0, STR_STATION_BUILD_STATION_TYPE_TOOLTIP), SetScrollbar(WID_BROS_MATRIX_SCROLL),
-									EndContainer(),
+							NWidget(NWID_MATRIX, COLOUR_DARK_GREEN, WID_BROS_MATRIX), SetPIP(0, 2, 0),
+								NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_BROS_IMAGE), SetMinimalSize(66, 60),
+										SetFill(0, 0), SetResize(0, 0), SetDataTip(0x0, STR_STATION_BUILD_STATION_TYPE_TOOLTIP), SetScrollbar(WID_BROS_MATRIX_SCROLL),
 								EndContainer(),
 							EndContainer(),
 						EndContainer(),