When a trade is open, Zorro spams the window and log with the fill status constantly, like so:

[MATIC-PERP::L78131] filled 1 lots of 1
[MATIC-PERP::L78131] filled 1 lots of 1
[MATIC-PERP::L78131] filled 1 lots of 1

At every BrokerTrade call. Verbose = 7 says it does that and I used that for testing, but even with Verbose = 0, they still appear. How to disable them?

Maybe you have not the current release? I remember a prerelease had this.

It's happening with 2.48.0

In the 2.50 release candidate it is indeed not a problem, the message only gets printed once when the trade is filled. Though even with Verbose=7 it only prints one. Don't know if that's the intended behavior since the manual says it logs every BrokerTrade call.

It logs every new fill. It nothing is filled, nothing is logged.

For really logging every call you need to set the DIAG flag.