SonicWall TZ300 Log Entries notification

I started receiving notifications from my SonicWall TZ300 stating that the log entries are at 75% of maximum.  Do I need to go in and delete old entries, or will the entries start rolling old for new when it hits 100%?  I am managing my first SonicWall, and am learning it, but can find nothing relating to this notification.  Any help would be greatly appreciated.