I use
add_action( 'show_user_profile', 'my_func' );
add_action( 'edit_user_profile', 'my_func' );
but this functions are only displayed on SUB-SITE user-profiles… How to make them to be shown in GLOBAL MULTISITE user-profile?
I mean, I want to set some fields for users that will be global, not only per-site.
It depends on how these functions are being set up.
Most likely right now these are set in a theme file somewhere. In that case, they will only run for the sites that have that theme enabled.
I have not tried it, but I believe if you move the code that accomplishes your goal into a plugin, and then enable that plugin as a global plugin, you should get those fields added to all user profiles across the multisite.