Can't you set the height of this vertical line in echarts's tooltip?

recently do chart access, understand the echarts, results to achieve the prompt box encountered a lot of problems, basically found on the Internet and documents, but this requirement, a little uncomfortable has been unable to solve.

now my effect is

ui

:

would you like to ask if this needs to be set, or can"t be adjusted.
and the protruding part of the triangle, do I need to write css or echarts can also be set? (I haven"t inquired about this question carefully)

there are those who understand this question, if you can make an answer, there are one or two points of inspiration, but also grateful!

ps: when the auxiliary line is on the left, the tooltip is displayed on the right, so that when you click to the 8910 month on the right, the tooltip will exceed the rightmost of the phone.

Echarts
Apr.11,2021 
tooltip: {
    formatter: params => {
        let str = '';
        // str += `<h6 style="color:-sharpfff;font-size:13px;margin:4px 0">${params[0].name}</h6>`;
        params.forEach(item => {
            //html
        });
        return str;
    }
}

small triangles need to be drawn by themselves. Echarts does not have this setting

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