Сделал сворачивание через меню настроек.

src/Visual_DVM_2021/UI/Main/TestingForm.java

@@ -135,6 +135,9 @@ public class TestingForm implements FormWithSplitters, TestingWindow {
         Global.testingServer.db.sapforConfigurationCommands.mountUI(sapforConfigurationCommandsPanel);
         Global.testingServer.db.serverSapfors.mountUI(serverSapforsPanel);
         Global.testingServer.db.sapforPackages.mountUI(sapforPackagesPanel);
+        //--
+        if (Global.properties.collapseCredentials)
+            CollapseCredentials();
     }
     //-
     @Override
@@ -305,7 +308,6 @@ public class TestingForm implements FormWithSplitters, TestingWindow {
         credentialsPanel.add(UI.credentialsBar);
         SC71.setDividerLocation(30);
         SC71.setDividerSize(0);
-        //SC71.setEnabled(false);
         credentialsPanel.revalidate();
         credentialsPanel.repaint();
     }
@@ -314,19 +316,8 @@ public class TestingForm implements FormWithSplitters, TestingWindow {
         UI.Clear(credentialsPanel);
         credentialsPanel.add(SC18);
         SC71.setDividerLocation(200);
-        //SC71.setEnabled(true);
         SC71.setDividerSize(3);
         credentialsPanel.revalidate();
         credentialsPanel.repaint();
     }
-    @Override
-    public void SwitchCredentials(boolean flag) {
-        if (flag) {
-            ExpandCredentials();
-        } else {
-            CollapseCredentials();
-        }
-        Global.properties.collapseCredentials = !flag;
-        Global.properties.Update();
-    }
 }