OSX & Windows Lima clients use the local storage of your computers to store temporarily some of the data you are using. For example, when you copy a filen into the Lima Volume, this file will be temporarily buffered into your device local storage until it has been downloaded by your Lima. Then, the space will be free-d. For now, the Lima application uses the main partition of your device. You need this partition to be big enough to contain the cache of your important files or the files being transfered to your Lima. You cannot for now ask the Lima application to use several of your partitions.