Configuration Manager - Channels
It is possible to determine the number of days content is considered as “New” for learners.
New flag
This setting determines the duration for which the "New" flag remains visible on content. The flag is removed earlier if a user interacts with the content before the specified time expires. If the content is not accessed within the defined period, the flag disappears automatically once the time elapses. The time can also be configured so the flag remains indefinitely unless the user takes action.