Good day and a good work week =)
I already understood …
As for Multisite Language, Switcher is also aware, but there is no way to create a multisite … at least in the preparatory part of this project … this is due to the fact that I’m not developing a project for myself, but I’m twisting it on my personal domain, and I’ve bought it only one domain name …
In general problem was in the third level domain … such a plugin as “Elementor” also does not support normal work with third-level domains …
I understand this “merit” is the implementation of the plugin interpreter “Polylang” … he does so much apparently somewhere in the script there are errors … although it is more likely that these are not errors, and not the orientation to this kind of thing, like a third-level domain, looks like this: the control buttons are not displayed and instead of them the squares, errors in connecting scripts, css files (and so on and so on) from the other domain that does not match the currently used ones (this is the protection of the browsers themselves) are added to the console.
Thank you anyway for your sympathy and good luck and prosperity to your ideas and to you =)
IMPORTANT:
For those who will encounter such a problem:
1) Polylanguage should be switched to multilanguage mode with the address of the form: youdomain.com*/com*/
* – ru, de, fr, au and other.
And then the plugins working not stable in different languages, most likely will start working normally …
2) use the Multisite Language Switcher as suggested by Arno Welzel (@awelzel) but here you need to configure the network from the sites and each to manage individually.