Multi factor authentication (MFA) is a security feature that requires users to verify their identity using two or more factors when they log in to Salesforce. It can help prevent unauthorized access to Salesforce by adding an extra layer of protection beyond username and password. Enabling MFA can be done by administrators in the security settings or by users in their personal settings. Disabling TLS requirements for sessions, customizing organization wide defaults, or enabling caching and autocomplete on login page are not actions that would prevent unauthorized access to Salesforce; in fact, they may reduce security or have no effect on security at all.References:https://help.salesforce.com/s/articleView?id=sf.security_mfa.htm&type=5