What's the name of that grey bar that appears when I hover over a bar?

What’s the name of that grey bar that appears when I hover over a bar? If I click on it, it lets me select or delete the bar. But it’s driving me crazy, always getting in the way, and I can’t work out how to disable it because I don’t know what it’s called so I can’t look it up in the documentation!

It’s the System Track. In Windows you can show or hide it with Alt+T.

Perfect! Thanks.

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You can also disable it by default in new Projects in Preferences.