1、显示行号File->Settings->Editor->General->Appearance右侧，Show line numbers

2、设置字体大小与行间距File->Settings->Editor->Font

3、颜色设置File->Settings->Editor->Colors Scheme->General，右侧选择Text->Default text，更改其背景

如果你刚开始也和我一样选的暗色背景，选Default

护眼豆沙绿：C7EDCC