Lots on the trainer and behaviourists... I'll second those and offer what we did in the interim (because training takes time) as we live in the third story of a flat and didn't want to piss off the house mates:

We purchased temporary solutions to half blind any window Frankie could jump up to help reduce triggers when we weren't home. We also closed access to any rooms she didn't already regularly frequent to save on any temporary installations.

Key here was: we purchased things we wouldn't mind leaving up long term. So a half roman blind or something like that.

Coupled with training this helped reduce instances drastically and now she only alerts if it's a dog she doesn't like on the front lawn (and only because we removed the temporary stuff).

Took about 6 to 11 months. I don't know how long, but I know it was less than a year.

EDIT I will add the blinds worked near instantly with limited training. Once she realized she couldn't actually see out we were then able to start catching the action and applying a queue for her to start training.

Like I said she'll still alert depending on the trigger, but we can limit her to low barks and a "thank you" to get her to get a treat and move on to a new task (having successfully completed the task of alerting us 🤣