Create a React component

Create a responsive component  React - Multiselect with search

For wide screens

when expanded 

The component supports groups

When clicking on a country, a group of resorts opens to the right of the country

When a country is selected, all subordinates are selected. The search line displays the country and the number of selected resorts

For mobile screens

when expanded, the list window takes up the entire screen

When selected, a list of resorts and the button "Apply" + button "Cancel" opens

The selection is formed in the object CountySelected

The list of countries is taken from the object Country