Dog Barking at Dogs Walking by Front Yard

Hello,

We recently moved into a house that has a fenced in front and back yard (they're connected). We want to let our dog roam free but she barks and acts aggressive at the fence to some dogs walking by the house. Is there a way to correct this behavior?

She's a good dog, and really only acts like this way when in our new yard. When we walk her, she doesn't have this behavior. She'll sniff the dog and move on or try to play. Also, we'll tie her up in front of restaurants/coffee shops when we go in and she doesn't act aggressively when dogs walk by, we've done this since she was a puppy with no issues. Finally, it's not every dog that walks by the house..

I do want to say, the place we moved from had a really mean, big dog move in next door a few months ago (It's one of the reasons we moved). It barked nonstop when it was outside, which was usually all day and into the night, and would try to escape to get at my dog. I really think it affected my dogs mental state because she is a protector so I think she was constantly on alert ever since the dog moved in. I think this is part of her current behavior.

The house is in a city and we get a lot of foot traffic past the house so I hope we can correct this behavior because she LOVES being outside laying in the sun and ppl watching. It's her favorite!

In case you need the breed 25% Aussie 25% Cattle dog 50% Mutt (she has some German Shepherd in her)

Let me know if anyone has ideas!