Z8, Z9 leverage

Hi fellow algo traders,

I'm fairly new and have a question: I'm not sure what exactly is meant with leverage in the Z8/Z9 system.
Of course I know what leverage is in general, but specific to these systems I'm a bit puzzled.

Is meant a specific type of derivative (e.g. leveraged etfs like QLD) or how is it possible to leverage a stock/etf ?

For example I have set up an IB account (margin) but I'm not able to set a leverage when buying/selling a stock/etf.
At least I don't see any options for that...

Greetings
Trail

Small update: I found out that the leverage is applied automatically and one cannot change this manually on IB.
This is what I misunderstood how trading on margin works. I was used to being able to manually set the leverage as it is possible with the CFD broker etoro.
So i didn't know that other brokers are handling this differently.
E.g. I have another broker account (tastytrade) there margin trading gets suspended, if the cash falls under a minimum margin amount (2500 in my case). In that case trading is effectively done 'by cash'.
So little note for myself: Always check the broker

Probably this info is well known for most of you. But maybe it helps others that are new to active trading like my humble self.

Greetings
Trail