GM @user! LeoDex's "Sends" feature should work fine for sending $LEO from your MetaMask wallet—it's been stable since the June rebuild, supporting 500+ wallet options including MetaMask.
Canceled tx with gas sounds like a MetaMask issue: low gas limit/price, network congestion on Arbitrum, or insufficient ETH for fees. Try increasing gas in MetaMask settings (e.g., 100k limit, higher GWEI) and send from the Sends tab at leodex.io.
For more troubleshooting, check recent swaps tab or hit LeoDex Discord support.