OneDrive for business Multiple files download option missing

I have SharePoint 2019 on-prem. I wanted to download multiple files on single click, but button is not appearing.

As per this article this feature is already available in SharePoint 2019 version.

https://support.microsoft.com/en-us/office/download-files-and-folders-from-onedrive-or-sharepoint-5c7397b7-19c7-4893-84fe-d02e8fa5df05

Can anyone suggest what could be the possible reason ?