TIDAL and rekordbox allow users to access playlists, albums, and tracks saved in My Collection — all from inside rekordbox
That depends on your TIDAL subscription. Premium users can only stream in High Quality (AAC), while HiFi users have the option to choose between High Quality (AAC) and HiFi Quality (FLAC).
Go to my.tidal.com to manage your subscription and upgrade your plan to HiFi. Next time you login to your TIDAL account in rekordbox you will have HiFi streams available.
Offline mode is not currently supported. Please make sure you are online when streaming from TIDAL.