In Keplr Wallet, you can claim staking rewards from multiple chains either all at once or one by one.
Please note that to successfully claim rewards, your Available Balance must include enough tokens on each chain to cover the transaction fee. Make sure to always keep a small amount of tokens for fees.
If you have rewards to claim, the total amount will appear under Claimable Reward on the Keplr Wallet home screen. Click the downward arrow icon to see how much is available on each chain.
Click [Claim All] to claim rewards from all chains at once. To claim individually, hover over a specific reward and click the claim icon that appears. This will claim only that reward.