Thought I'd share this for others who are upgrading from Drupal 7 to Backdrop.
Sometimes after upgrading the admin menu could have menu items in the wrong place. Usually this is because the menu was probably messed up on your Drupal 7 site. If you're okay with losing the custom menu items in the "management" menu, this is what you need to do to reset it. (Following this thread https://drupal.stackexchange.com/questions/48515/how-to-completely-wipe-and-rebuild-drupal-menus).
I'm going to take the easiest approach for most people. (More experts may want to do this via the CLI).
- Backup your database!
- Download devel module and install. https://backdropcms.org/project/devel
- Go to Development > Execute PHP (/admin/devel/php).
- Then execute the following:
db_query("DELETE FROM {menu_links} WHERE module = 'system'");
db_query("DELETE FROM {menu_links} WHERE menu_name = 'management'");
menu_rebuild();
The admin menu should now be reset and look more normal.
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