Before you can set an appearance attribute or apply a style or an effect to a layer, group, or object, you must target the item in the Layers panel. Selecting an object or group using any selection method also targets the object or group in the Layers panel, but layers can only be targeted using the panel.
The target icon indicates whether an item in the layer hierarchy has any appearance attributes and whether it is targeted:
Indicates
the item is not targeted and has no appearance attributes beyond
a single fill and a single stroke.
Indicates
the item is not targeted but has appearance attributes.
Indicates
the item is targeted but has no appearance attributes beyond a single
fill and a single stroke.
Indicates
the item is targeted and has appearance attributes.
To
target an item in the Layers panel, click the item’s target icon.
A double ring or
indicates
that the item is targeted. Shift‑click to target additional items.