Layer Visibility

In V6, sometimes when I make a layer visible, that one layer becomes visible.

But other times, every layer because visible.

I presume there is some subtle user interface difference. If so, what determines which behavior occurs?

If you have a range of layers selected, then turning one On/Off effects them all.

That said, a range of selected layers is very visually obvious so not likely what you’re doing, but it’s the only thing I can think of.