Can I apply Style to the output of “Labeled” in the below ?
Manipulate[\[Lambda],
Control@{{\[Lambda], 401,
Style[" \[Lambda]", Black, Bold, 24]},
Range[401, 570, 1],
ControlType -> Slider,
ControlPlacement -> Bottom,
Appearance -> "Labeled",
ImageSize -> 200}]
That is on the right part of the Slider :

You want the option
BaseStyle(which appears inOptions[Slider]). E.g.When looking at this I noticed that you can also use the almost undocumented
ControlType -> LabeledSlider, just for something different.