An account have more than 20 office license。

The context does not describe any supported way to change how many Office or Microsoft 365 licenses are visible for selection on a single account, or to expand that selection list beyond the current behavior.

It only covers how to:

• Check which Microsoft 365 business product or license is assigned to an account and confirm that the needed license is present.
• Assign or reassign licenses in the Microsoft 365 admin center.
• Activate Office again after reinstalling or moving to a different device, including when the activation limit for a one‑time purchase or MAK/volume key has been reached.

From the available information, the supported actions are:

1. Verify which licenses are actually assigned and available to use on the account by checking the Subscriptions or Licenses pages.
2. If a specific license is not visible or not usable, work with the Microsoft 365 admin (for business licenses) to adjust which license is assigned, or to reassign a different license that includes the Office desktop apps.
3. For one‑time purchase Office (Office 2021/2019/2016, etc.), if activation fails because the activation limit has been reached, activation must be done by phone and Office uninstalled from the old device according to the transfer terms.

No additional mechanism is documented in the context for managing or displaying more than a certain number of licenses in the selection UI.

References:

• Microsoft 365 Apps activation error: "You currently have not been assigned an office license that includes the Office desktop apps"
• Troubleshoot installing Office
• What Microsoft 365 business product or license do I have?
• Unlicensed Product and activation errors in Office
• Activate Office after reinstalling or installing on a different device