A common problem is that samplers/compilations display not as a single album but as as many albums as there are tracks.
JRMC thinks tracks belong to 1 album if Album Title and Album Artist are the same.
Most of the time the problem with compilations is that the Album Artist is populated by different artist.
To solve this and to preserve the individual artist at the same time:
Procedure:
Alternative: use the Move /Copy Fields dialog

Artist is now a duplicate of Album Artist
Populate Album Artist with an identical value
Alternative: use the Tag panel and type the value for Album Artist
Refresh the view
Now the compliation appears as one album