Select Inventory from the hamburger menu.

Now you will see three options on the top left "Table View", "Add Item" and search icon, click on Search icon here.

Clicking on Search icon will open a search box below the buttons.

You can search the Inventory Item by typing the Item name in the search box.

Also, You can search the particular Inventory from the list of Items only by typing two letters of its name .

Clicking on that Item Name will open a pop up with all details filled.