According to https://github.com/tqdm/tqdm?tab=readme-ov-file#nested-progress-bars and https://github.com/tqdm/tqdm/blob/master/examples/parallel_bars.py,

    with futures.ProcessPoolExecutor(
        max_workers=PROCESSES,
        initializer=tqdm.tqdm.set_lock,
        initargs=(tqdm.tqdm.get_lock(),),
    ) as executor:

to share the same tqdm.tqdm._lock = TqdmDefaultWriteLock() among the processes.