Decor items can be found in your storage. To access your storage, click on Décor and then click the Storage tab.
To place an item into storage, click the Décor button then mouse over the item you want to store. With the item highlighted, click on the box icon and it will be added to your storage.
Important Reminder: This section will not contain any consumables as those are stored in the Items section. To access click on the Inventory button, click on box icon (next to Décor) labeled "my items".