Let me remember the map window

[qiaoxin136]

i created react app that is controlled by a checkbox to show the basin. however, if user check the checkbox, the window of the map goes back to the original setting.

here is the codesandbox link.

https://codesandbox.io/s/solitary-fog-qjyomi

i think it is related to this portion of code using Ref,

useEffect(() => {
const map = new window.google.maps.Map(ref.current, {
options: options
});
// console.log(map);
const contentString = '

' + "

";

setMap(map);

}, [roundtwo]);

Can anyone make some suggestion on how i can make some change to let the app remember the map window? Thanks.