Shared folder isn't visible on Samba/SMB

I have shared a folder with another user.

The shared folder is visible on the Nextcloud page.

Unfortunately the folder is not visible on Windows via Samba sharing. How can I view shared folders on Samba?

You’re mixing up two different protocols here. If you share a Nextcloud folder it can only be accessed using the WebDAV protocol, but Samba is using the SMB protocol. You can e.g. use davfs2 to mount it on the Linux console and then export it using Samba, or you use e.g. RaiDrive to mount it directly on your Windows client.