The Overview tab shows your overall net worth, wallet balance, earn balance, and a more detailed view of your staked assets/earnings.
Here we can see all of the information provided by the Overview section:
Net Worth - The total $ value of your wallet's assets + any balance you have from staking/earning.
Wallet Balance - The total $ value of your wallet's assets (without any staking/earning balances included).
Earn Balance - The total $ value earned so far through staking. Keep in mind that the earn balance has yet to be claimed so is not part of your wallet balance.
Earn - Any staked assets along with the current $ value and current APY % will be displayed here.