diff --git a/viewer/widgets/JFJochViewerSettingsDock.cpp b/viewer/widgets/JFJochViewerSettingsDock.cpp
index f130c717..7cf819aa 100644
--- a/viewer/widgets/JFJochViewerSettingsDock.cpp
+++ b/viewer/widgets/JFJochViewerSettingsDock.cpp
@@ -62,6 +62,7 @@ JFJochViewerSettingsDock::JFJochViewerSettingsDock(const SpotFindingSettings &sp
 QWidget *JFJochViewerSettingsDock::BuildGeometrySection() {
     auto *section = new CollapsibleSection("Geometry", this);
     auto *geom = new QFormLayout();
+    geom->setFieldGrowthPolicy(QFormLayout::AllNonFixedFieldsGrow);   // fields fill the panel width
 
     energy_ = new NumberLineEdit(1.0, 200.0, 12.4, 4, "keV", this);
     distance_ = new NumberLineEdit(10.0, 5000.0, 100.0, 2, "mm", this);
@@ -108,6 +109,7 @@ QWidget *JFJochViewerSettingsDock::BuildMXPage() {
     // --- Unit cell + space group (new: no input existed before) ---
     auto *cellSection = new CollapsibleSection("Unit cell", page);
     auto *cell = new QFormLayout();
+    cell->setFieldGrowthPolicy(QFormLayout::AllNonFixedFieldsGrow);
     cellKnown_ = new QCheckBox("Known unit cell", page);
     cell->addRow("", cellKnown_);
     cellA_ = new NumberLineEdit(1.0, 2000.0, 79.0, 3, "Å", page);
@@ -153,6 +155,7 @@ QWidget *JFJochViewerSettingsDock::BuildMXPage() {
     // --- Spot finding ---
     auto *spotSection = new CollapsibleSection("Spot finding", page);
     auto *spot = new QFormLayout();
+    spot->setFieldGrowthPolicy(QFormLayout::AllNonFixedFieldsGrow);
     auto *snr = new SliderPlusBox(1.0, 10.0, 0.1, 1, page);
     snr->setValue(spot_.signal_to_noise_threshold);
     auto *count = new SliderPlusBox(0.0, 100.0, 1.0, 0, page);
@@ -174,6 +177,7 @@ QWidget *JFJochViewerSettingsDock::BuildMXPage() {
     // --- Indexing ---
     auto *idxSection = new CollapsibleSection("Indexing", page);
     auto *idx = new QFormLayout();
+    idx->setFieldGrowthPolicy(QFormLayout::AllNonFixedFieldsGrow);
     auto *algo = new QComboBox(page);
     algo->addItem("Auto", static_cast<int>(IndexingAlgorithmEnum::Auto));
     algo->addItem("FFBIDX (GPU, known cell)", static_cast<int>(IndexingAlgorithmEnum::FFBIDX));
@@ -211,6 +215,7 @@ QWidget *JFJochViewerSettingsDock::BuildAzIntPage() {
 
     auto *azSection = new CollapsibleSection("Azimuthal integration", page);
     auto *az = new QFormLayout();
+    az->setFieldGrowthPolicy(QFormLayout::AllNonFixedFieldsGrow);
     auto *lowQ = new SliderPlusBox(1e-5, 10.0, 0.001, 4, page);
     lowQ->setValue(azint_.GetLowQ_recipA());
     auto *highQ = new SliderPlusBox(2e-5, 10.0, 0.001, 4, page);