You can not manage fee because you don't have private key with your exchange account.
Exchanges are greed and they don't care that transaction fee on Bitcoin network is expensive or cheap than usual. They charge you a fixed withdrawal fee per one withdrawal. The joke is when transaction fee is cheap, they don't change it but if transaction fee goes high, more expensive, they will increase that fixed withdrawal fee and charge more fee on users.
The realm of cryptocurrencies appears highly promising in terms of profitability, prompting exchanges to confidently impose substantial fees on their users. Individuals who have just made a large withdrawal do not mind bearing such fees. However, for users who withdraw smaller amounts, they need to promptly seek alternatives in order to maximize their balances.
As long as this exchange continues to provide reliable and secure services, the issue of withdrawal fees will only be a concern for crypto users with small balances. There are still many users with significant balances who remain unaffected by this fee problem.