diff --git a/csaxs_bec/bec_widgets/widgets/sample_storage/sample_storage.py b/csaxs_bec/bec_widgets/widgets/sample_storage/sample_storage.py
index 99f86b7a..d3a5b55c 100644
--- a/csaxs_bec/bec_widgets/widgets/sample_storage/sample_storage.py
+++ b/csaxs_bec/bec_widgets/widgets/sample_storage/sample_storage.py
@@ -130,6 +130,8 @@ EMPTY_LABEL = "— empty —"  # what an empty cell shows in the GUI
 # OMNY-specific layout
 OMNY_SHUTTLE_LETTERS = ("A", "B", "C")
 OMNY_SHUTTLE_SLOTS = tuple(range(1, 7))
+# places as on the real shuttle: 3 rows x 2 columns, 1 2 / 3 4 / 5 6 (Mirko 2026-10-27; was 2 x 3)
+OMNY_SHUTTLE_COLS = 2
 OMNY_FIXED_POSITIONS = (10, 11, 12, 13, 14, 32, 33, 34, 100, 101)
 OMNY_PARKING_SLOTS = tuple(range(1, 7))
 # OMNYSampleStorage.unset_shuttle_slot()'s own empty sentinel -- unlike sample
@@ -446,7 +448,8 @@ class OMNY_SampleStorage(BECWidget, QWidget):
       - Header: Stage and Gripper, right-click correctable
       - Grid: the 10 fixed O positions, right-click correctable
       - Three shuttle sections (A/B/C): installed/active status line
-        (right-click to assign/clear a parking slot) + a 6-slot grid,
+        (right-click to assign/clear a parking slot) + a 6-slot grid as on the
+        real shuttle (3 rows x 2 columns: 1 2 / 3 4 / 5 6),
         right-click correctable
       - Caveat line: records only, not hardware
 
@@ -999,7 +1002,7 @@ class OMNY_SampleStorage(BECWidget, QWidget):
             slot_grid = QGridLayout()
             slot_grid.setSpacing(4)
             for idx, n in enumerate(OMNY_SHUTTLE_SLOTS):
-                r, c = divmod(idx, 3)
+                r, c = divmod(idx, OMNY_SHUTTLE_COLS)
                 key = ("shuttle", letter, n)
                 cell = _SlotCell(key, self, COLOR_SLOT_BORDER, caption=f"{letter}-{n}")
                 self._cells[key] = cell
@@ -1403,7 +1406,7 @@ class OMNY_SampleStorage(BECWidget, QWidget):
             usable_w = pdf.w - 2 * margin
             cell_h = 28
 
-            # shuttles A/B/C: status line + 3-wide slot grid, side by side
+            # shuttles A/B/C: status line + slot grid as on the shuttle (3 rows x 2), side by side
             shuttle_y0 = pdf.get_y()
             shuttle_w = usable_w / 3
             for si, letter in enumerate(OMNY_SHUTTLE_LETTERS):
@@ -1419,9 +1422,9 @@ class OMNY_SampleStorage(BECWidget, QWidget):
                 pdf.set_font("Helvetica", "B", 9)
                 pdf.cell(shuttle_w, 5, status_text, align="L")
 
-                slot_w = shuttle_w / 3
+                slot_w = shuttle_w / OMNY_SHUTTLE_COLS
                 for idx, n in enumerate(OMNY_SHUTTLE_SLOTS):
-                    r, c = divmod(idx, 3)
+                    r, c = divmod(idx, OMNY_SHUTTLE_COLS)
                     x = x0 + c * slot_w
                     y = shuttle_y0 + 6 + r * cell_h
                     key = ("shuttle", letter, n)