From the Theme Action button > click More tools.
This tool helps you easily to adjust tags of many product at once and useful for configuring Filter widget on collection page
You will see the bulk action list, It’s for making changes to all products in a collection at one click:
Add: Adds more tags to all products of this collection
Set: Replaces existing tags by the new ones to all products of this collection
Remove: Removes matching tags from all products of this collection
Detele: delete tags to all products
Toggle: Future Use, disabled…
Set the tag box: type tag names here
*Bulk filter: automatically generate tags for all products of the selected collection. You don’t need to type tag names to the box beside.
The tags are created corresponding to product’s vendor name, variant name such as Blue, S, M
*Bulk filter for collection: automatically generate tags for all products of the selected collection. You don’t need to type tag names to the box beside. The tags are created corresponding to product’s all collection names that products belongs to.
Ex) In the Men collection, it contains t-shirt and short. But short belongs to Clothing collection and Men collection. So that Bulk filter for collection generates tag Men for t-shirt and tags Men + Clothing for short
Hope you success!!