Last tested: Jul 22, 2020
There is no way to do this natively, but we can use table calculations as a workaround!
- Use if() in a table calc to create the "break" in the line by casting values after a certain point as null. Then create second table calc to cast values before that point as null
- Hide the original measure from the visualization
- Toggle off "plot null values" in the visualization settings
- Edit the series colors + types however you want :)