How to alter a theme for MU?

Well, each blog is independent, and the theme settings are independent to each blog.

You have to alter those settings to a global table instead, and probably alter the theme part so it shows the slideshow only from the main blog.

tx andrea_r,

Is there a function which returns the post of a certain blog_id???
I want to try to change the slideshow from

$args = array(
        'meta_key' => 'sgt_slide',
        'meta_value' => 'on',
        'numberposts' => -1,
        );
    $slides = get_posts($args);

to something like

$args = array(
        'meta_key' => 'sgt_slide',
        'meta_value' => 'on',
        'numberposts' => -1,
'blog_id' => 1,//only main blog
        );
    $slides = get_posts($args);

Any tips?

edit
ok i add this but now the featured image isn’t displayed??

switch_to_blog(1);
    $slides = get_posts($args);
	restore_current_blog();

ok switch_to_blog() and restore_current_blog in header.php did the trick so far.

But i can think of a view issues
1/ the search form will only search blog_id 1, right??
2/ making a custom menu i am happy with the general about, but when i add categories it only search the post from blog_id 1
3 How to combine sitewide and blog specific posts, tags, categories etc.

How can i alter the base domain url for the menu??
So i can have
https://subdomain.domain.com/category/slug-1

now it all points to
https://domain.com/category/slug-1

Well, you;re pulling it all from site 1…. so it shows the URL from site 1….

Each site is *independent*.