This specific rule enables traders to have a more lenient system where drawdowns are not calculated daily but rather a specific limit that goes along with your account instead.
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Max. End of Day (EOD) Trailing Drawdown will be set to 3% for account sizes 100K and 150K (4% for 50K accounts). Once you have gained the 3%, your max drawdown will be locked in the initial account balance + $100

To put it in perspective, we have some examples:
Account Size: 100,000

Max EOD Trailing DD = 3%

Account Balance = 103,000

Max EOD DD Limit = 100,100