How to remove a hook written with $this?

$this refers to the class “WeDevs_Dokan” most likely.

Replace:

remove_action( 'dokan_new_product_after_product_tags', array( $this, 'add_product_brand_field' ) );

With:

remove_action( 'dokan_new_product_after_product_tags', array( 'WeDevs_Dokan', 'add_product_brand_field' ) );

And see if that works. Sometimes classes are namespaced, so check the file to see if that’s the case and include that before the WeDev_Dokan string.

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