Layers

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The Layers tab is accessed by clicking the 3 horizontal lines in the right-hand toolbar. The Layers tab shows you an ordered list of all the blocks in use on the page.
To hide a block, toggle the eyeball icon to the left of the block name. Hiding a block will keep it and its content in the page but will not be published (or viewable by the public). You can also reorder blocks by clicking the crosshair icon and dragging the block to its new position.