No configuration is necessary for Lumin gapless playback of Tidal album in FLAC format using a Tidal HiFi account.
If you have a Tidal Premium account, I'm afraid you'd need to upgrade to HiFi for that.
If you have a Tidal HiFi account and your album is not gapless, please check whether it's FLAC or AAC. If it's lossy AAC there's nothing we can do. If it's lossless FLAC for every track of the album but it's not gapless, please let me know the album and artist - I'll verify it for you next week after our public holiday. (Note: There are Tidal albums in which not all the tracks are in the same format.)