используйте следующую опцию vAxis ...
textPosition: 'none'
см. Следующий рабочий фрагмент ...
google.charts.load('current', {
packages: ['corechart']
}).then(function () {
var data = google.visualization.arrayToDataTable([
['x', 'y0', 'y1', 'y2'],
[0, 10, 12, 18],
[2, 16, 18, 19],
[4, 18, 19, 24],
[6, 26, 28, 22],
[8, 13, 15, 21],
[10, 32, 31, 33]
]);
var options = {
chartArea: { width: '80%' },
colors: ['#00ff00', '#ff0000'],
vAxis: {
textPosition: 'none',
title: 'Satisfaction',
maxValue: 100,
minValue: -100,
gridlines: { count: 2 }
},
legend: { position: 'bottom' }
};
var chart = new google.visualization.LineChart(document.getElementById('chart'));
chart.draw(data, options);
});
<script src="https://www.gstatic.com/charts/loader.js"></script>
<div id="chart"></div>