diff --git a/src/meshlab/dialogs/filter_dock_dialog.cpp b/src/meshlab/dialogs/filter_dock_dialog.cpp
index 7b4c1c777..069444e5b 100644
--- a/src/meshlab/dialogs/filter_dock_dialog.cpp
+++ b/src/meshlab/dialogs/filter_dock_dialog.cpp
@@ -59,9 +59,6 @@ FilterDockDialog::FilterDockDialog(
 			ui->previewCheckBox->setVisible(false);
 		}
 	}
-	ui->parameterFrame->showNormal();
-	ui->parameterFrame->adjustSize();
-	showNormal();
 }
 
 FilterDockDialog::~FilterDockDialog()
diff --git a/src/meshlab/rich_parameter_gui/richparameterlistframe.cpp b/src/meshlab/rich_parameter_gui/richparameterlistframe.cpp
index dfed59d2c..ef2e8140c 100644
--- a/src/meshlab/rich_parameter_gui/richparameterlistframe.cpp
+++ b/src/meshlab/rich_parameter_gui/richparameterlistframe.cpp
@@ -108,6 +108,9 @@ void RichParameterListFrame::toggleHelp()
 	isHelpVisible = !isHelpVisible;
 	for(int i = 0; i < helpList.count(); i++)
 		helpList.at(i)->setVisible(isHelpVisible);
+	setMinimumSize(sizeHint());
+	adjustSize();
+	updateGeometry();
 }
 
 unsigned int RichParameterListFrame::size() const