No. Once your trading account has been created, its account type (Standard or Raw) cannot be changed.
If you wish to use a different account type or switch between Swap and Swap-Free, you will need to open a new MT5 account through your FNmarkets Dashboard and select your preferred option during the account creation process.
Please note that Swap-Free Accounts are subject to FNmarkets' eligibility criteria, approval, and the Swap-Free Terms and Fair Use Policy.