If you are searching for products in the product picker, it can be done in the following ways.
Searching using product name
Searching using id
Searching using hanle using hanlde
If you have a store with a large catalog, it will be preferred to search either by id or by handle.
Searching using ID
If you want to search using id enter the search query in the format
id:product_id
You can get the search id from the shopify admin
Once you have the product id handy, you can enter the product query in the format id:product_id
and the result will come
Searching using Handle
Handle is a unique identifier present for the product in the url
Example if the url is
https://atmospherestudio.in/products/bloat-no-more
the handle would bebloat-no-more
If you want to search using the handle you can enter
handle:bloat-no-more