diff --git a/.changeset/adaptive-bezier-label-midpoint.md b/.changeset/adaptive-bezier-label-midpoint.md
new file mode 100644
index 00000000000..75477c2b7c9
--- /dev/null
+++ b/.changeset/adaptive-bezier-label-midpoint.md
@@ -0,0 +1,5 @@
+---
+"@hashintel/petrinaut": patch
+---
+
+Arc weight labels sit on the Adaptive Bezier curve instead of floating at the straight-line midpoint between the arc's endpoints.
diff --git a/.changeset/sidebar-row-label-width.md b/.changeset/sidebar-row-label-width.md
new file mode 100644
index 00000000000..ca6b3badd13
--- /dev/null
+++ b/.changeset/sidebar-row-label-width.md
@@ -0,0 +1,5 @@
+---
+"@hashintel/petrinaut": patch
+---
+
+Sidebar list labels use the full row width and truncate with an ellipsis consistently; the row menu button only takes space while hovering the row or while its menu is open.
diff --git a/libs/@hashintel/petrinaut/src/ui/views/Editor/panels/LeftSideBar/subviews/filterable-list-sub-view.tsx b/libs/@hashintel/petrinaut/src/ui/views/Editor/panels/LeftSideBar/subviews/filterable-list-sub-view.tsx
index 73ed26bcdd4..6fd2c2b3274 100644
--- a/libs/@hashintel/petrinaut/src/ui/views/Editor/panels/LeftSideBar/subviews/filterable-list-sub-view.tsx
+++ b/libs/@hashintel/petrinaut/src/ui/views/Editor/panels/LeftSideBar/subviews/filterable-list-sub-view.tsx
@@ -52,22 +52,15 @@ const listItemRowStyle = cva({
       true: {
         cursor: "pointer",
 
-        /* Reveal the action button on hover or when its menu is open */
+        /* Reveal the action button on hover or when its menu is open. Hidden
+           with `display` rather than `opacity` so it takes no space and the
+           label keeps the full row width until the button is shown. */
         "& [data-row-action]": {
-          opacity: "[0]",
-          transition: "[opacity 150ms ease-out]",
-        },
-        "& [data-row-action] svg": {
-          transform: "[translateX(2px)]",
-          transition: "[transform 150ms ease-out]",
+          display: "none",
         },
         "&:hover [data-row-action], & [data-row-action][data-state=open]": {
-          opacity: "[1]",
+          display: "flex",
         },
-        "&:hover [data-row-action] svg, & [data-row-action][data-state=open] svg":
-          {
-            transform: "none",
-          },
       },
     },
     isSelected: {
@@ -118,6 +111,7 @@ const listItemContentStyle = css({
 
 const listItemNameStyle = css({
   flex: "[1]",
+  minWidth: "[0]",
   fontSize: "sm",
   fontWeight: "medium",
   lineHeight: "snug",
@@ -125,6 +119,13 @@ const listItemNameStyle = css({
   overflow: "hidden",
   textOverflow: "ellipsis",
   whiteSpace: "nowrap",
+  /* renderItem may nest its own lines (e.g. a name with a subtitle); each
+     line truncates the same way plain-text items do. */
+  "& *": {
+    overflow: "hidden",
+    textOverflow: "ellipsis",
+    whiteSpace: "nowrap",
+  },
 });
 
 const LIST_ITEM_ICON_SIZE = 12;
diff --git a/libs/@hashintel/petrinaut/src/ui/views/SDCPN/components/arc.tsx b/libs/@hashintel/petrinaut/src/ui/views/SDCPN/components/arc.tsx
index 23304b0e88b..87e3d15c049 100644
--- a/libs/@hashintel/petrinaut/src/ui/views/SDCPN/components/arc.tsx
+++ b/libs/@hashintel/petrinaut/src/ui/views/SDCPN/components/arc.tsx
@@ -248,7 +248,6 @@ function getCustomArcPath({
   targetPosition: Position;
 }): [path: string, labelX: number, labelY: number] {
   const dx = targetX - sourceX;
-  const dy = targetY - sourceY;
 
   // Control point offset scales with horizontal distance, with a minimum
   const offset = Math.max(Math.abs(dx) * 0.7, 80);
@@ -260,9 +259,9 @@ function getCustomArcPath({
 
   const path = `M ${sourceX},${sourceY} C ${cp1x},${cp1y} ${cp2x},${cp2y} ${targetX},${targetY}`;
 
-  // Label at the midpoint of the cubic bezier (t=0.5)
-  const labelX = sourceX + dx / 2;
-  const labelY = sourceY + dy / 2;
+  // Label at the midpoint of the cubic bezier: B(0.5) = (P0 + 3·CP1 + 3·CP2 + P3) / 8
+  const labelX = (sourceX + 3 * cp1x + 3 * cp2x + targetX) / 8;
+  const labelY = (sourceY + 3 * cp1y + 3 * cp2y + targetY) / 8;
 
   return [path, labelX, labelY];
 }