Remove acknowledged set

[AlessandroInfo]

Hi, I set ack (acknowledge) from not acknowloedge some triggers... but now I can't see this on the list of problem, if I see only active and no ack trigger.
I need to remove this ack set because the problems not solve, so I need to return to the no ack status.
It is possible? An example in the attached image.
Thank you

[AlessandroInfo]

Hi, I set ack (acknowledge) from not acknowloedge some triggers... but now I can't see this on the list of problem, if I see only active and no ack trigger.
I need to remove this ack set because the problems not solve, so I need to return to the no ack status.
It is possible? An example in the attached image.
Thank you

I use a workaround: I removed hosts and rescan them, so was generated new alarms
I hope it can help others with the same need.
Ciao,
Alessandro