private void adjustActionState() {
		boolean validCodeUnit = (currentProgram != null && currentCodeUnit != null);
		int selRowCnt = refsTable.getSelectedRowCount();
		addRefAction.setEnabled(validCodeUnit);
		deleteRefAction.setEnabled(selRowCnt != 0 || refsTable.getSelectedRowCount() != 0);
		editRefAction.setEnabled(selRowCnt == 1);
		goHomeAction.setEnabled(validCodeUnit);
	}
Size the columns such that the interesting ones are wider than the
uninteresting columns.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/references/EditReferencesProvider.java