I installed Multisite 3.5.1 (sub-directories) with 2 sites (Main Site and Site1). I have the following problem:
1. E.g. I install "Membership Premium Plugin" or other plugin ( Network Admin > Plugins ) using my Super Admin, keeping "Network Deactivated". When I log in Dashboard Site1, using User1 and go to Plugins there is a "Membership Premium Plugin" to activate.
How is this possible? I kept "Network Deactivated". Is user1 a Admin? This user1 was created when I created the site1 (Network Admin > Sites > Add New sites).