General

The Inventory filter provides means to look for products with specific stock amount either per product or per each single variant.
Out of stock checkbox is self-explanatory, filters out products with exactly zero stock, it works for products with continue selling turned off only. Stock field you can choose a stock number and find products with higher or lower stock per total/variant stock. Exclude continue selling products excludes any variant if it has continue selling checked, this helps stores search exclusively for products with tracked stock.

Total Inventory

Relating to stock of the product, if there are multiple variants then stock is summed. Exclude continue selling products Can’t check since exclude continue selling is per variant.

Variant Inventory

Relating to individual variant stock inside a product. If any variant matches the criteria the product will be filtered.