Hide Your Other Layers In The Blink Of An Eye
To hide an individual layer, click on the Eye icon in the first column next to that layer in the Layers palette. To make the layer visible again, click on the spot where the Eye icon used to be. If you want to keep one layer visible and hide all the others, hold the Option key (PC: Alt key) and click on the Eye icon beside the layer you want to keep visible. To make the other layers visible again, repeat the process.