The layout editor in Hyperview allows you to select multiple assets, shapes, or labels at the same time. When you select an item on the layout a red outline will be displayed on it. Each subsequent item you click on the layout will also be outlined in red indicating that you have made multiple selections. If you click an item that is already selected and outlined, then it will deselect that item. If you click the background image (or an empty space on the layout) then it will deselect all items.

If multiple assets are moving when you attempt to move a single asset, it is likely that you have multiple assets selected. Deselect the assets and ensure you have only one selected before continuing with the move operation.