Users on mac are reporting an issue seeing their transactions unverified in the transaction history, or have unsynced blocks/incomplete block header downloaded. Users must first close the electrum wallet and then simply navigate to the ~/.electrum-zcl/ directory and delete the blockchain_headers file. Restart the electrum wallet and it should begin re-downloading the blockchain headers. This is a known issue for the first boot of the wallet being unable to fully download all the blocks.
Please see below picture for blockchain synchronization status (Tools, Network)
For more information, visit the official ZClassic github repo: https://github.com/BTCP-community/electrum-zcl
MBP:$ du -sh blockchain_headers