thunderbird: adding guides for visual improvement or cleanup

wiki/thunderbird.md

@@ -35,3 +35,26 @@ Under the tasks tab it is possible to show only incomplete tasks aswell as other
 using the selection on the left hand site of the screen.
 Alternatively complete tasks can be hidden by selecting "View" in the top bar, then "Tasks" and
 finally "Incomplete Tasks".
+
+### Hide Local Folders
+
+This section is based on a
+[forum post by Mapenzi](https://www.thunderbird-mail.de/forum/thread/92315-115-lokale-ordner-ausblenden/?postID=518346#post518346).
+The local folders can be hidden by opening the meatballs menu to the immediate right of the `New
+Message`-button and selecting `Hide Local Folders`.
+
+### Revert to Default Folder Order
+
+The order of the folders of an account can be reset by right-clicking the account in the Mail-tab
+and then selecting `Reset Folder Order`.
+
+### Hide Default Address Book
+
+This section is based on a
+[blog post by Attiks](https://tips.attiks.com/2018/05/03/thunderbird-hide-default-address-book).
+By default thunderbird uses an address book called `Personal Address Book`.
+When using a remote address book which is synced the default address book is often not needed.
+It can be hidden by selecting `Edit` (if the top bar is not visible `Alt` can be pressed to display
+it), `Settings` and `Config Editor...`.
+In the config editor search for the value `ldap_2.servers.pab.dirType` and set the value from the
+default (which is `101`) to `-1` to hide the default address book.