Network Switcher. There is current support for 2 bridges, Rinkeby<->xDai and Mainnet<->xDai. Switching to the appropriate network in MetaMask will also influence the display. The UI uses xDai, the former name of the Gnosis Chain.
History Tab. Shows previous transactions and any available claims.
Advanced. Use to set an alternate receiving address on the destination chain (send to another address)
ERC-721 & ERC-1155 Support. Scroll down to see any ERC-1155 Tokens owned by the connected address. You can transfer multiple ERC-1155s with a single bridge tx.