This is a setting that can be enabled for any wallet that is synced through an API.
The APIs will report the balances of your wallets but in some cases, these reported balances can be wrong (most commonly when staking as some APIs don't consider staked assets when reporting the balances).

In these cases, you can ignore the reported balances which tells Koinly to display only the calculated balances.
This setting will only affect the dashboard and wallet overview. It will not affect the calculations or reports in any way.

This is how you enable the setting:

Click on the affected wallet and then click on the Auto-Sync enabled banner:

You will then be able to toggle this setting: