Not reported in the public reviews. Reviewers summarise selectively, so this usually means it wasn't discussed publicly, not that it wasn't studied.
Biodistribution & persistence
Low bioavailability limits tissue distribution; rat liver and pancreas levels ~10x plasma
“Due to maralixibat’s low bioavailability, distribution to other tissues is low, although maralixibat was also found in the liver and pancreas of the rat at levels approximately 10 times higher than plasma.”
Fat-soluble vitamin reduction with no no-effect dose; FSV monitoring in patients advised
“However, none of the toxicity studies established a no-effect dose for reductions in the serum or liver levels of fat-soluble vitamins. Therefore, the animal data could be relevant to the risk in humans, suggesting a need for monitoring of the levels of FSVs in patients.”