thanks for the answer, David,
I installed the multisite according to the instructions (https://codex.www.ads-software.com/Create_A_Network) and I meant sub-directories when I was speaking of subfolders.
So, I’m pretty sure that I correctly installed the multisite… the only reason was to make some pages visible to anyone while most pages remain limited to selected members and unfortunately, this is not working.
any additional advice?