Hi @斌 董
Unfortunately, customizing tool pinning in default devtools is not a choice currently. However, focus mode is here for you. In focus mode, you can customize your tools in an "activity bar". Accidentally closing your tools may be impossible since you can only close them by right-clicking them and selecting the "remove" option.
To enable focus mode, please go to Settings --> Experiments --> select Focus Mode, and restart the devtools.
For more information of focus mode, please consult this doc.
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Regards,
Yu Zhou