Here’s one way to hide it with CSS:
add_action( 'personal_options', function( $profileuser )
{
?><style>.show-admin-bar{ display: none;}</style><?php
} );
or rather place it within the <head>...</head> with:
add_action( 'admin_print_styles-user-edit.php', 'wpse_hide_admin_bar_settings' );
add_action( 'admin_print_styles-profile.php', 'wpse_hide_admin_bar_settings' );
function wpse_hide_admin_bar_settings()
{
?><style>.show-admin-bar{ display: none;}</style><?php
}
You could perhaps add your own wpse_hide_admin_bar_settings filter if you need more control:
function wpse_hide_admin_bar_settings()
{
if( (bool) apply_filters( 'wpse_hide_admin_bar_settings', false ) )
echo '<style>.show-admin-bar{ display: none;}</style>';
}
and then turn it off/on with:
add_filter( 'wpse_hide_admin_bar_settings', '__return_false' ); // show it
add_filter( 'wpse_hide_admin_bar_settings', '__return_true' ); // hide it