gtk:frame-label-align (frame)

frame -- a gtk:frame widget
xalign -- a number coerced to a single float for 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 -- a number coerced to a single float for 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 will not be painted because the label will be completely above or below the frame

Gets or sets the the x and y alignment of the frame's label. The default values for a newly created frame are 0.0 and 0.5.