Since PoE's Delve League, the game has packaged a set of default template loot filters, and now you have to replace them one-to-one. NO.1 How to install custom loot filters and sounds
The default loot filter is "OK," which is loaded into the game by default.
However, the information provided here will open the door for you so that you (the player) can understand how the item filter works. For those who have no programming or website development experience, the code for the project filter may look complicated.
This feature can shorten the time required to find useful/valuable items in the game. Grinding Gear Games has implemented item filters in the PoE UI, so players can customize how the game client displays items on the ground.