The suspense account is a system code for anything that hasn’t been allocated (such as untagged bank entries or opening balances that haven’t been journalled). As such, it can’t be emptied or removed from the nominal view itself.
If you delete untagged bank entries or correct any opening balances, then the balance will become zero.
There’s more info on this, in this topic
Please let me know if you need help with any of these.