Add an event listener to the "close" button of your sidebar messenger to detect when it is closed.

Use JavaScript to store the current scroll position when the "close" button is clicked. You can do this by setting a variable to the current scroll position using the window.pageYOffset property.

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var scrollPosition = window.pageYOffset;
Use JavaScript to store the scroll position in a cookie or local storage. For example, you can use the localStorage.setItem() method to store the scroll position.
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localStorage.setItem('scrollPosition', scrollPosition);
Add an event listener to the "open" button of your sidebar messenger to detect when it is reopened.

Use JavaScript to retrieve the stored scroll position from the cookie or local storage.

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var scrollPosition = localStorage.getItem('scrollPosition');
Use JavaScript to set the scroll position to the stored value. You can do this by setting the window.pageYOffset property to the stored value.
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window.pageYOffset = scrollPosition;
By using these steps, users will be able to return to the same page position after closing and reopening the sidebar messenger on your website.