When syncing my EVM wallets, Koinly automatically adds the "Pool in/Pool out" tags when farming tokens.
But if the tag was added incorrectly (e.g. due to misleading function name) it cannot be removed - if you unpool, it's automatically added back during recalculations.
Workaround
I can duplicate the transaction (using the 3-dot menu next to it) and delete the original. Unpooled duplicate will not be pooled again after recalculations