Token balances in your Flex Account are displayed on the left sidebar in the “Wallet” section.
Clicking on a token will load that token’s chart and select it for the swap form.
The Flex interface aggregates same-token balances across networks. For example, if you have 4 USDC on Optimism and 6 USDC on Arbitrum, the Flex interface will show a USDC balance of 10. When you swap USDC for any other token on any other chain, the balances on both networks will be used.