While using Black Formatter in VSCode, we can set the maximum line length to prevent some code to be wrapped lines by reformat operation.

Add these in setting.json.

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{
    "black-formatter.args": [
        "--line-length",
        "90"
    ]
}

Before:

After:

About the best line length number, refer to Black document.

In general, 90-ish seems like the wise choice.