How to add filtering function back to global

How to add filtering function back to global
Using the example and instructions in the link below, but I do not have a filter button on my custome form control.
https://docs.erpnext.com/docs/user/manual/en/creating-custom-link-field#adding-filters-to-link-field

Any suggestions would be highly appreciated.

Running ErpNext v15
Hosted on Frappe Cloud

Hi @tzg19880816,

Filter feature is not available in version 15 yet. It’s available on the develop branch.
Please check it.

Also, I updated the documentation.

Thank You!

How do I use it in the development branch? Are there any specific steps?

You must install ERPNext from the development branch.

Is there any way to add it to the official version?