Allow the UI layout to be fully locked or to prevent docking changes. Fixes #2653

docs/en_US/menu_bar.rst

@@ -25,6 +25,9 @@ Use the *File* menu to access the following options:
 +-------------------------+---------------------------------------------------------------------------------------------------------+
 | *Reset Layout*          | If you have modified the workspace, click to restore the default layout.                                |
 +-------------------------+---------------------------------------------------------------------------------------------------------+
+| *Lock Layout*           | Click to open a submenu to select the level for locking the UI layout                                   |
+|                         | This can also be changed from browser display :ref:`preferences <preferences>`                          |
++-------------------------+---------------------------------------------------------------------------------------------------------+
 
 The Object Menu
 ***************

docs/en_US/preferences.rst

@@ -38,10 +38,6 @@ Use the fields on the *Display* panel to specify general display preferences:
   attempt to catch browser close or refresh events and prompt before allowing
   them to continue.
 
-* When the *Show system objects?* switch is set to *True*, the client will
-  display system objects such as system schemas (for example, *pg_temp*) or
-  system columns (for example,  *xmin* or *ctid*) in the tree control.
-
 * When the *Enable browser tree animation?* switch is set to *True*, the client
   will display the animated tree control otherwise it will be unanimated.
 
@@ -49,6 +45,23 @@ Use the fields on the *Display* panel to specify general display preferences:
   the client will display the animated dialogues/notifications otherwise it
   will be unanimated.
 
+* Use the *Lock layout* field to lock the UI layout at different levels. This
+  can also be changed from File menu on the :ref:`menu bar <menu_bar>`
+
++---------------------+-------------------------------------------------------------------+
+| Option              | Action                                                            |
++=====================+===================================================================+
+| *None*              | No locking. Every panel is resizable and dockable.                |
++---------------------+-------------------------------------------------------------------+
+| *Prevent docking*   | This will disable the docking/undocking of the panels             |
++---------------------+-------------------------------------------------------------------+
+| *Full*              | This will disable resizing, docking/undocking of the panels       |
++---------------------+-------------------------------------------------------------------+
+
+* When the *Show system objects?* switch is set to *True*, the client will
+  display system objects such as system schemas (for example, *pg_temp*) or
+  system columns (for example,  *xmin* or *ctid*) in the tree control.
+
 Use the fields on the *Keyboard shortcuts* panel to configure shortcuts for the
 main window navigation:
 

docs/en_US/release_notes_4_8.rst

@@ -4,8 +4,12 @@ Version 4.8
 
 Release date: 2019-06-27
 
-This release contains a number of bug fixes since the release of pgAdmin4 4.7.
+This release contains a number of bug fixes and new features since the release of pgAdmin4 4.7.
 
+New features
+************
+
+| `Feature #2653 <https://redmine.postgresql.org/issues/2653>`_ - Allow the UI layout to be fully locked or to prevent docking changes.
 
 Bug fixes
 *********