- created a new custom layout based on the Grid Layout where I can set the horizontal and vertical spacings between grid items and used it throughout the app

appPlugins/ToolOptimal.py

@@ -9,7 +9,7 @@ from PyQt6 import QtWidgets, QtCore, QtGui
 
 from appTool import AppTool
 from appGUI.GUIElements import OptionalHideInputSection, FCTextArea, FCEntry, FCSpinner, FCCheckBox, FCComboBox, \
-    FCLabel, FCButton, VerticalScrollArea
+    FCLabel, FCButton, VerticalScrollArea, FCGridLayout
 from camlib import grace
 
 from shapely.geometry import MultiPolygon
@@ -446,7 +446,7 @@ class OptimalUI:
         self.layout.addWidget(FCLabel(""))
 
         # ## Grid Layout
-        grid0 = QtWidgets.QGridLayout()
+        grid0 = FCGridLayout(v_spacing=3)
         grid0.setColumnStretch(0, 0)
         grid0.setColumnStretch(1, 1)
         self.layout.addLayout(grid0)