private void chooseExplicitAlign() {
		if (model.getAlignmentType() != AlignmentType.EXPLICIT) {
			Composite viewComposite = model.viewComposite;
			int defaultValue = 1;
			if (viewComposite.isPackingEnabled()) {
				defaultValue = viewComposite.getDataOrganization().getMachineAlignment();
			}
			model.setAlignmentType(AlignmentType.EXPLICIT, defaultValue);
		}
		explicitAlignTextField.selectAll();
		explicitAlignTextField.requestFocus();
	}
Sets the currently displayed structure packing value (maximum component alignment)
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/compositeeditor/CompEditorPanel.java