Separate Slider Control in different panel from Light - How to?

I would like to have a grid of light entities on the left hand side of my dashboard… and on the right, have a slider and colour control that I can use.

I would like to press the light that im wanting to change, and then use the slider / colour control to adjust that light… How can I separate that set of slider controls so that it works with whatever light I have “active” at the time? I hope that makes sense.

This has something my wife has asked for, so has strong WAF demand :wink:

No one ?? Bueller?