Its value can’t be edited. The expiration message in the My Account Library section:
Is set in the My Account Library Components template’s libraryItem.expirationMsg model:
For PSC external terms, the expiration date will always be set far away in the future (years 3000+) since the access actually is set to "Never expire" and will only be revoked if the PSC validation fails.
You can remove the line below in order for the expiration date not to be shown in the My Account's Library tab.
HTML
<span ng-bind-html="libraryItem.expirationMsg"></span>