diff --git a/internal/ui/shell.go b/internal/ui/shell.go
index 2cb73f8..42978c7 100644
--- a/internal/ui/shell.go
+++ b/internal/ui/shell.go
@@ -20,6 +20,14 @@ const (
 	pageCreate
 )
 
+const (
+	instanceNameColumnWeight      = 25
+	instanceBrowserColumnWeight   = 12
+	instanceDirectoryColumnWeight = 39
+	instanceStatusColumnWeight    = 14
+	instanceStartColumnWeight     = 10
+)
+
 type PathField string
 
 const (
@@ -265,15 +273,13 @@ func (s *Shell) instances(gtx layout.Context) layout.Dimensions {
 		layout.Flexed(1, func(gtx layout.Context) layout.Dimensions {
 			return material.List(s.theme, &s.list).Layout(gtx, len(s.rows), func(gtx layout.Context, i int) layout.Dimensions {
 				row := s.rows[i]
-				return layout.Inset{Bottom: unit.Dp(10)}.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
+				return layout.Inset{Right: unit.Dp(4), Bottom: unit.Dp(10)}.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
 					return layout.Flex{Alignment: layout.Middle}.Layout(gtx,
-						layout.Flexed(30, material.Body1(s.theme, row.Name).Layout),
-						layout.Flexed(14, material.Body2(s.theme, row.Browser).Layout),
-						layout.Flexed(26, pathCell(s.theme, row.UserDataDir)),
-						layout.Flexed(16, statusLabel(s.theme, row.Status)),
-						layout.Flexed(14, func(gtx layout.Context) layout.Dimensions {
-							return material.Button(s.theme, s.startClickFor(row.ID), "启动").Layout(gtx)
-						}),
+						layout.Flexed(instanceNameColumnWeight, material.Body1(s.theme, row.Name).Layout),
+						layout.Flexed(instanceBrowserColumnWeight, material.Body2(s.theme, row.Browser).Layout),
+						layout.Flexed(instanceDirectoryColumnWeight, pathCell(s.theme, row.UserDataDir)),
+						layout.Flexed(instanceStatusColumnWeight, statusLabel(s.theme, row.Status)),
+						layout.Flexed(instanceStartColumnWeight, s.instanceStartButton(s.startClickFor(row.ID))),
 					)
 				})
 			})
@@ -284,21 +290,35 @@ func (s *Shell) instances(gtx layout.Context) layout.Dimensions {
 }
 
 func (s *Shell) instanceHeader(gtx layout.Context) layout.Dimensions {
-	return layout.Flex{Alignment: layout.Middle}.Layout(gtx,
-		layout.Flexed(30, material.Caption(s.theme, "实例名称").Layout),
-		layout.Flexed(14, material.Caption(s.theme, "浏览器类型").Layout),
-		layout.Flexed(26, material.Caption(s.theme, "用户数据目录").Layout),
-		layout.Flexed(16, material.Caption(s.theme, "状态").Layout),
-		layout.Flexed(14, material.Caption(s.theme, "启动").Layout),
-	)
+	return layout.Inset{Right: unit.Dp(4)}.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
+		return layout.Flex{Alignment: layout.Middle}.Layout(gtx,
+			layout.Flexed(instanceNameColumnWeight, material.Caption(s.theme, "实例名称").Layout),
+			layout.Flexed(instanceBrowserColumnWeight, material.Caption(s.theme, "浏览器类型").Layout),
+			layout.Flexed(instanceDirectoryColumnWeight, material.Caption(s.theme, "用户数据目录").Layout),
+			layout.Flexed(instanceStatusColumnWeight, material.Caption(s.theme, "状态").Layout),
+			layout.Flexed(instanceStartColumnWeight, func(gtx layout.Context) layout.Dimensions {
+				return layout.E.Layout(gtx, material.Caption(s.theme, "启动").Layout)
+			}),
+		)
+	})
 }
 
 func pathCell(theme *material.Theme, path string) layout.Widget {
 	style := material.Body2(theme, path)
-	style.MaxLines = 2
+	style.MaxLines = 1
 	return style.Layout
 }
 
+func (s *Shell) instanceStartButton(click *widget.Clickable) layout.Widget {
+	return func(gtx layout.Context) layout.Dimensions {
+		return layout.E.Layout(gtx, func(gtx layout.Context) layout.Dimensions {
+			style := material.Button(s.theme, click, "启动")
+			style.Inset = layout.Inset{Top: unit.Dp(6), Right: unit.Dp(10), Bottom: unit.Dp(6), Left: unit.Dp(10)}
+			return style.Layout(gtx)
+		})
+	}
+}
+
 func statusLabel(theme *material.Theme, status string) layout.Widget {
 	style := material.Label(theme, unit.Sp(13), status)
 	style.Color = map[string]color.NRGBA{
diff --git a/internal/ui/shell_test.go b/internal/ui/shell_test.go
index ab7bc6e..772c91e 100644
--- a/internal/ui/shell_test.go
+++ b/internal/ui/shell_test.go
@@ -38,6 +38,19 @@ func TestShellInstanceRowsContainRequiredColumnsAndIndependentStartControls(t *t
 	}
 }
 
+func TestInstanceListColumnWeightsPrioritizeDirectoryAndCompactAction(t *testing.T) {
+	got := instanceNameColumnWeight + instanceBrowserColumnWeight + instanceDirectoryColumnWeight + instanceStatusColumnWeight + instanceStartColumnWeight
+	if got != 100 {
+		t.Fatalf("instance column weights = %d, want 100", got)
+	}
+	if instanceDirectoryColumnWeight <= instanceNameColumnWeight {
+		t.Fatal("user data directory must have the widest instance-list column")
+	}
+	if instanceStartColumnWeight >= instanceStatusColumnWeight {
+		t.Fatal("start action column must remain compact")
+	}
+}
+
 func TestShellCancelsOnlyTheActivePathSearch(t *testing.T) {
 	shell := NewShell(material.NewTheme())
 	started := make(chan struct{}, 1)