flx: 修复会默认出现水平滚动条的问题

[Kataick]

What this PR does / why we need it?

修复会默认出现水平滚动条的问题

Summary of your change

此问题出现在v1.10.16-lts， #6491 改动导致的
受影响的页面有概览 网站/网站 数据库 容器等

Please indicate you've done the following:

• Made sure tests are passing and test coverage is added if needed.
• Made sure commit message follow the rule of Conventional Commits specification.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

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