解决办法：在全局样式表中加入
.el-scrollbar__wrap { overflow-x: hidden; }

参考：https://blog.csdn.net/qq_34870529/article/details/96168420?spm=1001.2101.3001.6661.1&utm_medium=distribute.pc_relevant_t0.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-1.pc_relevant_default&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-1.pc_relevant_default&utm_relevant_index=1

https://blog.csdn.net/weixin_43216105/article/details/89520534