protected boolean hideTabArea() {
		return tabPane.getTabCount() == 1 &&
			leadingComponent == null &&
			trailingComponent == null &&
			clientPropertyBoolean( tabPane, TABBED_PANE_HIDE_TAB_AREA_WITH_ONE_TAB, hideTabAreaWithOneTab );
	}
Returns {@code true} if tab placement is top/bottom and text is painted horizontally or
if tab placement is left/right and text is painted vertically (rotated).
flatlaf-core/src/main/java/com/formdev/flatlaf/ui/FlatTabbedPaneUI.java