I there a bug in this - I am trying to restrict the export function (entirely limit the range of special pages) in a simple way... but it seems like nothing is working for me. (I did try to mess with the $wgGroupPermissions - but I backed that out totally - and now lockdown is the only extension!
# Lockdown start
wfLoadExtension( 'Lockdown' );
Seems like this installed correct. But neither of these restricts 'user' from going to the (special page) export page...
$wgActionLockdown['Export'] = [ 'sysop' ];
$wgSpecialPageLockdown['Export'] = [ 'user' ];
and this is what I tired initially... after/while I was logged in as sysop..
$wgNamespacePermissionLockdown[NS_SPECIAL]['*'] = [ 'sysop' ];
(version 1.32.0)