To Create a New Layer That is Visible in Only One Viewport

Click a layout tab.
Double-click within a layout viewport to make it current.
Create a layer.
1. In the Layer Properties Manager, click New Layer.
2. Enter a new layer name by typing over the highlighted layer name.
  - Layer names can be up to 255 characters long (double-byte or alphanumeric), and include letters, numbers, spaces, and several special characters.
  - Layer names cannot include the following characters: < > / \ “ : ; ? * | = ‘
Right-click the new layer and choose VP Freeze Layer > In All Viewports Except Current.
In the New VP Freeze column, click the icon to change the layer's state so the layer is frozen in any new viewport created.