Question Domain Connect link changes only A record or nameserver or...

[JeffreyZ]

I haven't used Domain Connect, but looks like it could be helpful for clients who don't want to provide their login credentials for the registrar -- probably only an issue with Google Domains where email accounts presumably share the same credentials.

I have a link that looks like this:
Anmelden – Google Konten (my IP).

If i send my client this link, would she be changing just the A record, or does that change the nameserver to my DNS server? Her email is with Google Workspace. I just want the A record changed.