Remove pool tag?

Describe the problem:
I accidentally tagged a transaction as “sent to pool” - how do we clear this setting? I see that about a year ago there was talk about adding a feature to support this, has it been done yet? I cannot delete and resync the entire wallet as there are thousands of transactions there, many of which I already corrected manually.

Which exchange/wallet is this regarding?

How did you import data into this wallet?
Auto sync

What have you tried to fix this so far?
Looked at the tx settings to see if I could clear the pool setting.

I have the exact same worry and problem - this seems like a simple and obvious addition to koinly, we just need to be able to manually tag our transactions more than once!