Microsoft Excel Remote Code Execution Vulnerability

According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?
An attacker must send a user a malicious Office file and convince them to open it.

According to the CVSS metric, the attack vector is local (AV:L). Why does the CVE title indicate that this is a remote code execution?
The word Remote in the title refers to the location of the attacker. This type of exploit is sometimes referred to as Arbitrary Code Execution (ACE). The attack itself is carried out locally. This means an attacker or victim needs to execute code from the local machine to exploit the vulnerability.

Is the Preview Pane an attack vector for this vulnerability?
No, the Preview Pane is not an attack vector.

Security updates
16.0.10417.20034 — https://support.microsoft.com/help/5002752
https — https://docs.microsoft.com/en-us/officeupdates/microsoft365-apps-security-updates
16.100.25081015 — https://go.microsoft.com/fwlink/p/?linkid=831049
16.0.5513.1000 — https://support.microsoft.com/help/5002758