diff --git a/tools/cabana/detailwidget.cc b/tools/cabana/detailwidget.cc
index ab723fa0e2..543946b19a 100644
--- a/tools/cabana/detailwidget.cc
+++ b/tools/cabana/detailwidget.cc
@@ -48,7 +48,6 @@ DetailWidget::DetailWidget(ChartsWidget *charts, QWidget *parent) : charts(chart
 
   // msg widget
   splitter = new QSplitter(Qt::Vertical, this);
-  splitter->setAutoFillBackground(true);
   splitter->addWidget(binary_view = new BinaryView(this));
   splitter->addWidget(signal_view = new SignalView(charts, this));
   binary_view->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Minimum);
diff --git a/tools/cabana/detailwidget.h b/tools/cabana/detailwidget.h
index 2794d41b99..b7cfed376c 100644
--- a/tools/cabana/detailwidget.h
+++ b/tools/cabana/detailwidget.h
@@ -30,7 +30,6 @@ public:
   DetailWidget(ChartsWidget *charts, QWidget *parent);
   void setMessage(const MessageId &message_id);
   void refresh();
-  QSize minimumSizeHint() const override { return binary_view->minimumSizeHint(); }
 
 private:
   void showTabBarContextMenu(const QPoint &pt);
diff --git a/tools/cabana/signalview.cc b/tools/cabana/signalview.cc
index e3c19faa13..4eb1456b1e 100644
--- a/tools/cabana/signalview.cc
+++ b/tools/cabana/signalview.cc
@@ -168,6 +168,8 @@ QVariant SignalModel::data(const QModelIndex &index, int role) const {
       if (item->type == Item::Signed) return item->sig->is_signed ? Qt::Checked : Qt::Unchecked;
     } else if (role == Qt::DecorationRole && index.column() == 0 && item->type == Item::ExtraInfo) {
       return utils::icon(item->parent->extra_expanded ? "chevron-compact-down" : "chevron-compact-up");
+    } else if (role == Qt::ToolTipRole && item->type == Item::Sig) {
+      return (index.column() == 0) ? item->sig->name : item->sig_val;
     }
   }
   return {};
@@ -323,11 +325,25 @@ QSize SignalItemDelegate::sizeHint(const QStyleOptionViewItem &option, const QMo
       int spacing = option.widget->style()->pixelMetric(QStyle::PM_TreeViewIndentation) + color_label_width + 8;
       it = width_cache.insert(text, option.fontMetrics.width(text) + spacing);
     }
-    width = std::min(width, it.value());
+    width = std::min<int>(option.widget->size().width() / 3.0, it.value());
   }
   return {width, QApplication::fontMetrics().height()};
 }
 
+bool SignalItemDelegate::helpEvent(QHelpEvent *event, QAbstractItemView *view, const QStyleOptionViewItem &option, const QModelIndex &index) {
+  if (event && event->type() == QEvent::ToolTip && index.isValid()) {
+    auto item = (SignalModel::Item *)index.internalPointer();
+    if (item->type == SignalModel::Item::Sig && index.column() == 1) {
+      QRect rc = option.rect.adjusted(0, 0, -option.rect.width() * 0.4, 0);
+      if (rc.contains(event->pos())) {
+        event->setAccepted(false);
+        return false;
+      }
+    }
+  }
+  return QStyledItemDelegate::helpEvent(event, view, option, index);
+}
+
 void SignalItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const {
   int h_margin = option.widget->style()->pixelMetric(QStyle::PM_FocusFrameHMargin) + 1;
   int v_margin = option.widget->style()->pixelMetric(QStyle::PM_FocusFrameVMargin);
@@ -363,25 +379,30 @@ void SignalItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &op
       painter->fillRect(option.rect, option.palette.highlight());
     }
 
-    drawSparkline(painter, option, index);
+    int adjust_right = ((SignalView *)parent())->tree->indexWidget(index)->sizeHint().width() + 2 * h_margin;
+    QRect r = option.rect.adjusted(h_margin, v_margin, -adjust_right, -v_margin);
     // draw signal value
-    int right_offset = ((SignalView *)parent())->tree->indexWidget(index)->sizeHint().width() + 2 * h_margin;
-    QRect rc = option.rect.adjusted(0, 0, -right_offset, 0);
-    auto text = painter->fontMetrics().elidedText(index.data(Qt::DisplayRole).toString(), Qt::ElideRight, rc.width());
+    QRect value_rect = r.adjusted(r.width() * 0.6 + h_margin, 0, 0, 0);
+    auto text = painter->fontMetrics().elidedText(index.data(Qt::DisplayRole).toString(), Qt::ElideRight, value_rect.width());
     painter->setPen(option.palette.color(option.state & QStyle::State_Selected ? QPalette::HighlightedText : QPalette::Text));
-    painter->drawText(rc, Qt::AlignRight | Qt::AlignVCenter, text);
+    painter->drawText(value_rect, Qt::AlignRight | Qt::AlignVCenter, text);
+
+    QRect sparkline_rect = r.adjusted(0, 0, -r.width() * 0.4 - h_margin, 0);
+    drawSparkline(painter, sparkline_rect, index);
   } else {
     QStyledItemDelegate::paint(painter, option, index);
   }
 }
 
-void SignalItemDelegate::drawSparkline(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const {
+void SignalItemDelegate::drawSparkline(QPainter *painter, const QRect &rect, const QModelIndex &index) const {
   static std::vector<QPointF> points;
   const auto &msg_id = ((SignalView *)parent())->msg_id;
   const auto &msgs = can->events().at(msg_id);
+
   uint64_t ts = (can->lastMessage(msg_id).ts + can->routeStartTime()) * 1e9;
   auto first = std::lower_bound(msgs.cbegin(), msgs.cend(), CanEvent{.mono_time = (uint64_t)std::max<int64_t>(ts - settings.sparkline_range * 1e9, 0)});
   auto last = std::upper_bound(first, msgs.cend(), CanEvent{.mono_time = ts});
+
   if (first != last) {
     double min = std::numeric_limits<double>::max();
     double max = std::numeric_limits<double>::lowest();
@@ -398,16 +419,13 @@ void SignalItemDelegate::drawSparkline(QPainter *painter, const QStyleOptionView
       max += 1;
     }
 
-    int h_margin = option.widget->style()->pixelMetric(QStyle::PM_FocusFrameHMargin);
-    int v_margin = std::max(option.widget->style()->pixelMetric(QStyle::PM_FocusFrameVMargin) + 2, 4);
-    const double xscale = (option.rect.width() - 175.0 - h_margin * 2) / settings.sparkline_range;
-    const double yscale = (option.rect.height() - v_margin * 2) / (max - min);
-    const int left = option.rect.left();
-    const int top = option.rect.top() + v_margin;
+    const double xscale = rect.width() / (double)settings.sparkline_range;
+    const double yscale = rect.height() / (max - min);
     for (auto &pt : points) {
-      pt.rx() = left + pt.x() * xscale;
-      pt.ry() = top + std::abs(pt.y() - max) * yscale;
+      pt.rx() = rect.left() + pt.x() * xscale;
+      pt.ry() = rect.top() + std::abs(pt.y() - max) * yscale;
     }
+
     painter->setPen(getColor(sig));
     painter->drawPolyline(points.data(), points.size());
     if ((points.back().x() - points.front().x()) / points.size() > 10) {
diff --git a/tools/cabana/signalview.h b/tools/cabana/signalview.h
index 50ba4e06b8..8bc9477888 100644
--- a/tools/cabana/signalview.h
+++ b/tools/cabana/signalview.h
@@ -83,7 +83,8 @@ public:
   void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
   QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const;
   QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
-  void drawSparkline(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;
+  bool helpEvent(QHelpEvent *event, QAbstractItemView *view, const QStyleOptionViewItem &option, const QModelIndex &index) override;
+  void drawSparkline(QPainter *painter, const QRect &rect, const QModelIndex &index) const;
   QValidator *name_validator, *double_validator;
   QFont small_font;
   const int color_label_width = 18;