Thank you very much, it helped me a lot.
It work perfectly now.
The problem is gone.
Is it ok to upgrade to the latest version now?
Theme: from version: 8.1.5 to version: 8.2.3
Core Plugin: from version 4.1.5 to version 4.2.3
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.