If a product is not appearing in Quick Sale, check the following settings:
Check the Product Type
Make sure the product type is set to Retail. Products marked as In-House are intended for use with services and will not appear for retail sales.
Check Stock Availability
Make sure the product has stock greater than 0.If you want to allow billing for products even when they are out of stock, go to Setup → Inventory Settings and enable Bill During Out of Stock.
Check Branch Assignment
Make sure the product has been added/assigned to the branch where you are trying to make the sale.
After verifying these settings, the product should appear in Quick Sale.