I am in the UK and see them all, with Mare in with the CDs, but Mare (Club Mixes) and Graal (Prologue) appear with Singles and EPs. This is because these last two are tagged as single and EP respectively.
Do the missing albums appear in your Singles and EPs list?
I am mostly using Roon as a frontend for tidal, which can do live DSD upsampling, and it’s always painful to navigate Tidal in Roon compared to the native app.
Is there a way to disable modifying Tidal metadata?
In general, Roon will always try and get what it thinks is the best overall metadata, and usually that entails adding to or, occasionally, modifying Tidal metadata.
In this case, as far as I can see, there is no other metadata; Allmusic shows nothing, so the data is from Tidal - apart from the EP/single flag. I don’t know where that has come from.
You can tell Roon to prefer metadata from a file if you have that, but I don’t think you can tell Roon to ignore the Tidal input apart from making the album unidentified. Adding metadata would then be up to you via manual Roon editing.
However, if you add an album to your library, you can then edit the album and change the EP or Single to Album and it will then present on the line you want.
In Roon, there is a difference between an album being IN your library or not.