Hi Wolfgang,
“Apply to All Sites” checkbox is available for the network activated User Role Editor, opened under Users menu of the main blog dashboard, not via Network admin. And user should be a super admin to see this option. Look on this screenshot:
https://storage.googleapis.com/role-editor/downloads/support/ure-multisite-apply-to-all.png
As I see “Network Update” button at your screenshot above – it was made under Network Admin, where this option is unavailable by design.
Regards,
Vladimir.
