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@dzik1331 Hi, this seems to be the expected result. The y-axis is hidden when x-axis's type is value or log by default.

you can check this commit which introduces this logic: 4acb689

Also, you can force the y-axis to show by implicity setting axisTick.show and axisLine.show to true. like this:

option = {
    xAxis: {
        type: 'category',
        data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
    },
    yAxis: {
        show:true,
        type: 'value',
        axisTick:{
          show:true,  
        },
        axisLine:{
            show: true
        },
    },
    series: [{
        data: [150, 230, 224, 218, 135, 147, 260],
        type: 'line'
    }]
};

@dzik1331 Hi, this seems to be the expected result. The y-axis is hidden when x-axis's type is value or log by default.

this is not exactly true! apparently, even xAxis.type = 'time' causes the yAxis axisLine to disappear too; and this although the default value is allegedly set to true (https://echarts.apache.org/en/option.html#yAxis.axisLine.show)