The source – twitter.com
Google Search is testing a filter button to refine your purchase query.
In search, this button looks like this:

Pressing the button opens the filter settings. They are related to shopping. Using them, you can sort the product by brand, length, size, material, print, style, reviews, distance of the seller, the number of items sold and other characteristics.
Google > Mobile
— Saad AK (@SaadAlikhan1994) June 11, 2022
I saw Filter button in search bar menu links.
It had multiple filters in it:
Filter By:
1: Department
2: Features
3: Brand
4: Material
5: Length
& Many more.
Sending to: @rustybrick SIR. pic.twitter.com/1oOlkaNMel