How to Set the Default Account
The default account is displayed in the top left corner of the app and is the account used for making calls. Click on the account name to open a dropdown menu, then select your desired account from the list.
In Settings
First, navigate to the Settings tab and click on 'Accounts'. The default account is indicated by the green call icon next to it. To change the default, right-click on the desired account and select the 'Default Account' option.