diff --git a/python_app/gui/controllers/app_window_preprocess_mixin.py b/python_app/gui/controllers/app_window_preprocess_mixin.py
index d3ad35b..47a9f2e 100644
--- a/python_app/gui/controllers/app_window_preprocess_mixin.py
+++ b/python_app/gui/controllers/app_window_preprocess_mixin.py
@@ -25,7 +25,7 @@ class AppWindowPreprocessMixin:
             self._show_error(f"Failed to open preprocessing panel: {exc}")
             return
 
-        dialog.show()
+        dialog.showMaximized()
         dialog.raise_()
         dialog.activateWindow()
 
diff --git a/python_app/gui/preprocess_dialog.py b/python_app/gui/preprocess_dialog.py
index 1c2f9a2..a554202 100644
--- a/python_app/gui/preprocess_dialog.py
+++ b/python_app/gui/preprocess_dialog.py
@@ -14,7 +14,9 @@ from PyQt6.QtWidgets import (
     QLineEdit,
     QPlainTextEdit,
     QPushButton,
+    QScrollArea,
     QVBoxLayout,
+    QWidget,
 )
 import numpy as np
 import pyqtgraph as pg
@@ -53,10 +55,20 @@ class PreprocessDialog(QDialog):
     def _build_ui(self) -> None:
         """Build root dialog layout and all sections."""
         root_layout = QVBoxLayout(self)
-        root_layout.addWidget(self._build_sets_group())
-        root_layout.addWidget(self._build_sequence_group())
-        self._build_status_line(root_layout)
-        self._build_preview_plot(root_layout)
+
+        scroll_area = QScrollArea(self)
+        scroll_area.setWidgetResizable(True)
+
+        content_widget = QWidget(scroll_area)
+        content_layout = QVBoxLayout(content_widget)
+        content_layout.addWidget(self._build_sets_group())
+        content_layout.addWidget(self._build_sequence_group())
+        self._build_status_line(content_layout)
+        self._build_preview_plot(content_layout)
+        content_layout.addStretch(1)
+
+        scroll_area.setWidget(content_widget)
+        root_layout.addWidget(scroll_area)
 
     def _build_sets_group(self) -> QGroupBox:
         """Build set-management controls used for preprocessing snapshots."""
@@ -119,6 +131,7 @@ class PreprocessDialog(QDialog):
         self._capture_log = QPlainTextEdit(group)
         self._capture_log.setReadOnly(True)
         self._capture_log.setPlaceholderText("Capture history per combo")
+        self._capture_log.setMinimumHeight(180)
         layout.addWidget(self._capture_log, 7, 0, 1, 2)
         return group
 
@@ -158,7 +171,8 @@ class PreprocessDialog(QDialog):
         self._preview_plot.showGrid(x=True, y=True, alpha=0.2)
         self._preview_plot.setLabel("bottom", "Frequency", units="Hz")
         self._preview_plot.setLabel("left", "Magnitude", units="dB")
-        root_layout.addWidget(self._preview_plot, stretch=1)
+        self._preview_plot.setMinimumHeight(320)
+        root_layout.addWidget(self._preview_plot)
 
     def set_name(self) -> str:
         """Return requested target set name."""