how to toggle: IPR preview selected lights and preview all lights together again

[caypiranha]

it´s probably to simple (or even a bug?), since I haven't found anything to change this behaviour. First time encountered this and yes, controlling only the selected light is also nice to have, but now I need to watch them all together...
I don´t catch it here for now...

with selected objects the same: as long I select something only that will be rendered. While nothing selected = rendering all again.

[hermit.crab]

We're talking about IPR's "Isolate selection" debug shading mode right? That's how it works - if you select something - only it is rendered; if nothing is selected - everything is rendered. What behaviour are you expecting?