TotalSegmentator extension is updated now to use the latest models, including the new total_mr. The update is available from tomorrow for both the latest Slicer Stable Release (Slicer-5.6) and latest Slicer Preview Release (Slicer-5.7 downloaded 2024-06-01 or later).
Example result for an abdominal MRI (source image: Imaging Data Commons / CMC-CRC-MSB-01262 / MRI Abdomen / 31 AX T1 3D FS 3MIN POST_W):
Slice sweep:
3D Rotation: