Gtk.Frame.prototype.set_label_align

function set_label_align(xalign:Number, yalign:Number):void {
    // Gjs wrapper for gtk_frame_set_label_align()
}

Sets the alignment of the frame widget's label. The default values for a newly created frame are 0.0 and 0.5.

xalign

The position of the label along the top edge of the widget. A value of 0.0 represents left alignment; 1.0 represents right alignment.

yalign

The y alignment of the label. A value of 0.0 aligns under the frame; 1.0 aligns above the frame. If the values are exactly 0.0 or 1.0 the gap in the frame won't be painted because the label will be completely above or below the frame.