Sorry that Lightroom Classic 10.1.1 is freezing when you export using the File> Export menu.
Would you mind sharing your computer's operating system and the location to which you're trying to export images?
Does the app freezes while exporting a specific set of images? Do you have any external drive or mobile device connected to your computer?
Would you mind restoring Lightroom Classic app preferences to default and let us know if the issue still persists? Please refer this a...