The maximum transaction size is 600,000 sats. You are not able to zap, deposit or withdraw more than 600,000 sats at a time.
The maximum wallet balance is 600,000 sats. You are not able to deposit if your wallet balance is greater than 600,000 sats.
You can increase your limits by connecting to a ZEBEDEE account. This will require you to verify your identity through a KYC (Know Your Customer) process. You will find the option to connect to ZEBEDEE in your Wallet or Profile menu.
Once you have connected to a ZEBEDEE account the following limits will apply:
You can learn more about top up limits, minimums and fees here.