I think you have to have additional X-axis (you can for example create transform column or use existing one) and then modify it as needed. In this example I have used Days in Operations as the x-axis but I have removed it from the BoxPlot variables
From here you can remove tick marks and the label
Graph Builder(
Size(706, 589),
Show Control Panel(0),
Variables(X(:Days in Operations), X(:Days in Operations), Y(:Value1), Y(:Value2, Position(1))),
Elements(Position(1, 1), Box Plot(Y(1), Y(2), Legend(20))),
Elements(Position(2, 1), Line Of Fit(X, Y(1), Y(2), Legend(16), Confidence of Fit(0)), Points(X, Y(1), Y(2), Legend(17))),
SendToReport(
Dispatch(
{},
"Days in Operations",
ScaleBox,
{Label Row({Automatic Font Size(0), Automatic Tick Marks(0), Show Major Labels(0), Show Major Ticks(0), Show Minor Ticks(0)})}
),
Dispatch({}, "X title", TextEditBox, {Set Text("")})
)
)
-Jarmo