[The_book]

By adding

class TXTUIForm(Ui_Form):
    def setupUi(self, Form):
        super(TXTUIForm, self).setupUi(Form)
        def delete(layout, widget):
            layout.removeWidget(widget)
            widget.deleteLater()
        delete(self.gridLayout,self.label_4)
        delete(self.gridLayout,self.opt_txt_output_formatting)
        delete(self.verticalLayout,self.opt_keep_color)

I remove formatting and keep text color in GUI