Hi Ouyan,
Greetings from Syncfusion support,
Based on the given screenshot, we have tried to reproduce the reported issue in the following ways
1. Destroying the Ribbon component with showlauncherIcon enabled/disabled.
2. Dynamically adding a tab item in the Ribbon tabs.
But unfortunately, we couldn't replicate the reported issue from our end.
Sample for your reference: https://stackblitz.com/edit/react-w83asc?file=index.js
However, could you please share the below details?
1. Any reproducing steps to replicate the issue from our end?
2. Are you using, any other components in the page along with the Syncfusion Ribbon?
3. Please share the code example or video demonstration or reproducing sample, if possible.
The above-requested details will be helpful for us to further validate on the issue and assist you better.
Regards,
Indrajith