Select Objects on the Layer(s) to be Isolated

After selecting one or more objects, all layers except the layers of the selected objects are either turned off, frozen in the current layout
viewport, or locked, depending on the current setting. The layers that remain visible
and unlocked are termed isolated.

If you make changes to layers within a session and you want to restore the layers
to the state they were in immediately before you entered the LAYISO command, use the
LAYUNISO command.

Settings

Controls whether layers are turned off, frozen in the current layout viewports, or
locked.

Off

Turns off or freezes all layers except the layers of the selected objects.

Vpfreeze

In a layout, freezes all but the selected layers in the current layout viewport only.
Other layout viewports in the drawing are unchanged.

If not in a layout, all other layers are turned off instead.

Off

Turns off all but the selected layers in all viewports.

Lock and Fade

Locks all layers except the layers of the selected objects, and sets the fading for
locked layers.