How to get rid of the "not responding" state when running a JavaFX application?

Question

Java

Good day. When the application is running, the message "not responding" appears near the window, although the application works quite well for itself. But at the same time, progress is not visible in any way (I track through the progress bars) due to the fact that the window is not updated. I tried to call the requestLayout method on the container (in my case AnchorPane). This did not give any visible results ...
Link to the repository: https://github.com/g0rd1/search-people
UpdateData method in src.main.java.control.Controller.java