What would have been one admin was on 3 sites. You can switch between domains inside it. Each domain will have its own content.

  • This is exactly real. here I give 100% that it is real, but I doubt 1) that you need it. 2) that you can do it. - Vladimir Klykov
  • @ Vladimir Klykov do not have to ernic. You can do it - give a person a sane answer. - KAGG Design
  • @KAGGDesign, the person asked the question, is it real or not, I answered his question, because I am 100% sure that you can "rewrite" the admin panel under his "wishes", but forgive me for rewriting my desire for exactly zero. and that it is out of the box in any version I do not know. - Vladimir Klykov
  • @Vladimir Klykov is not an answer, but an empty comment, from which it can be seen that 1) you cannot do this, 2) you have no knowledge of the subject. Since you do not have knowledge of WordPress, you should not draw conclusions about what people need or do not need. Multisite is a well-known, very common and popular WP mode. - KAGG Design
  • @KAGGDesign Let us not decide without reason what I can do and what is not, and pay attention to where exactly my “not answer” is placed =) in the comment and not as an answer. - Vladimir Klykov

2 answers 2

You need WordPress Multisite .

    What would have been one admin was on 3 sites.

    That's right - not possible by definition. An admin is a management interface for a specific site. But switching between admin areas is not a problem.

    To do this, either use network mode or plugins like https://wordpress.org/plugins/mainwp/

    Although what is the difficulty to go into the admin sites I personally do not understand.