Advanced phishing thresholds in anti-phishing policies in Microsoft Defender for Office 365

Hello,

we would like to adjust phishing thresholds from Standard(1) to Aggressive(2). Based on documentation from https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/set-up-anti-phishing-policies?view=o365-worldwide#advanced-phishing-thresholds-in-anti-phishing-policies-in-microsoft-defender-for-office-365 we can read:

• 2 - Aggressive: Messages that are identified as phishing with a high degree of confidence are treated as if they were identified with a very high degree of confidence.

Question is, how degree of confidence is calculated and where we can find what action will be done (how will be treated email) on each degree?