diff --git a/viewer/JFJochViewerDatasetInfo.cpp b/viewer/JFJochViewerDatasetInfo.cpp
index 985c3f6f..aa0a535c 100644
--- a/viewer/JFJochViewerDatasetInfo.cpp
+++ b/viewer/JFJochViewerDatasetInfo.cpp
@@ -251,8 +251,15 @@ void JFJochViewerDatasetInfo::UpdatePlot() {
                             RunColor(static_cast<int>(runs_.size())), XForRun(*live_run_)});
     }
 
+    // The whole dataset spans this many images (the largest run, i.e. the original file), so the
+    // x-axis is fixed to it and subset runs appear at their real position.
+    int64_t full_range = dataset->experiment.GetImageNum();
+    for (const auto &run: runs_)
+        if (run.dataset)
+            full_range = std::max<int64_t>(full_range, run.dataset->experiment.GetImageNum());
+
     chart_view->loadValues(data, image_number, one_over_d2, dataset.get(), primary_name,
-                           std::move(overlays), primary_color, XForRun(*dataset));
+                           std::move(overlays), primary_color, XForRun(*dataset), full_range);
 
     if (dataset->experiment.GetGridScan()) {
         stack->setCurrentWidget(grid_scan_image);
diff --git a/viewer/charts/JFJochDatasetInfoChartView.cpp b/viewer/charts/JFJochDatasetInfoChartView.cpp
index 25e65dde..77806db2 100644
--- a/viewer/charts/JFJochDatasetInfoChartView.cpp
+++ b/viewer/charts/JFJochDatasetInfoChartView.cpp
@@ -132,11 +132,12 @@ void JFJochDatasetInfoChartView::resetZoom() {
 void JFJochDatasetInfoChartView::loadValues(const std::vector<float> &input, int64_t image, bool one_over_d2,
                                             const JFJochReaderDataset *dataset, const QString &primaryName,
                                             std::vector<NamedSeries> overlays, const QColor &primaryColor,
-                                            std::vector<float> primaryX) {
+                                            std::vector<float> primaryX, int64_t fullRange) {
     m_yOneOverD = one_over_d2;
     primaryName_ = primaryName;
     primary_color_ = primaryColor;
     primary_x_ = std::move(primaryX);
+    full_range_ = fullRange;
 
     // d -> 1/d^2 for resolution plots; identity otherwise. Applied to every series alike.
     auto transform = [one_over_d2](const std::vector<float> &in, std::vector<float> &out) {
@@ -301,6 +302,9 @@ void JFJochDatasetInfoChartView::buildTimeDomainChart() {
         // ----- X axis handling -----
         QValueAxis *axisX = qobject_cast<QValueAxis *>(chart()->axisX(series));
         if (axisX) {
+            // Always span the whole dataset so a subset run shows at its real position, not stretched.
+            if (full_range_ > 1)
+                axisX->setRange(0, static_cast<double>(full_range_ - 1));
             if (goniometer_axis.has_value() && m_xUseGoniometerAxis) {
                 // Hide labels on numeric axis and move it to the top
 
diff --git a/viewer/charts/JFJochDatasetInfoChartView.h b/viewer/charts/JFJochDatasetInfoChartView.h
index ce3f6bca..98352e66 100644
--- a/viewer/charts/JFJochDatasetInfoChartView.h
+++ b/viewer/charts/JFJochDatasetInfoChartView.h
@@ -54,6 +54,7 @@ private:
     std::vector<NamedSeries> overlays_;
     QColor primary_color_;                // colour of the active (primary) run, if assigned
     std::vector<float> primary_x_;        // x (image numbers) for the primary series; empty => index
+    int64_t full_range_ = 0;              // total images in the dataset; fixes the x-axis to [0, n)
     // Append (binned) finite points of vals to s at x positions (xs empty => index), extending [mn,mx].
     void appendSeries(QLineSeries *s, const std::vector<float> &vals, const std::vector<float> &xs,
                       double &mn, double &mx) const;
@@ -99,7 +100,8 @@ public:
         const QString &primaryName = QString(),
         std::vector<NamedSeries> overlays = {},
         const QColor &primaryColor = QColor(),
-        std::vector<float> primaryX = {});
+        std::vector<float> primaryX = {},
+        int64_t fullRange = 0);
 };
 
 
diff --git a/viewer/jfjoch_viewer.cpp b/viewer/jfjoch_viewer.cpp
index 863a3e48..6b2cb111 100644
--- a/viewer/jfjoch_viewer.cpp
+++ b/viewer/jfjoch_viewer.cpp
@@ -29,6 +29,9 @@ int main(int argc, char *argv[]) {
     pal.setColor(QPalette::Highlight, QColor(0x2a, 0x9d, 0x8f));
     pal.setColor(QPalette::HighlightedText, Qt::white);
     app.setPalette(pal);
+    // Fusion fills QGroupBox interiors with a flat light colour; make them transparent so they show
+    // the salmon window background like the rest of the UI (entry widgets stay white via the palette).
+    app.setStyleSheet("QGroupBox { background-color: transparent; }");
 
     QIcon appIcon(":/jfjoch.png");
     app.setWindowIcon(appIcon);