When a user opens your PDF document, they see the initial view of the PDF. You can set the initial view to the magnification level, page and page layout that you want.
You may need to change the order of layers in the list, or move a layer from one layer group to another. In the navigation pane, to reorder a layer, just press Alt while you click the layer’s name and drag it to the desired location.
You can flatten layers by choosing Flatten Layers from the Layers panel menu, acknowledging the warning that the action can’t be undone, and then clicking OK.
You can merge layers by choosing Merge Layers from the Layers panel menu, selecting the layers to merge and the target layer, and then clicking OK to confirm.
To show or hide related content stored in a variable number of separate layers, you can simply refer to the Layers panel on the left side of the work area. You can view layers and choose to show or hide the content associated with each layer.