[BUG] dev tools in app tabs styling issue

[ruanyl]

Describe the bug

1. Data source selector moving from right to left
2. Unexpected extra space under tab title

Screenshot:

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To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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OpenSearch Version
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Dashboards Version
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Plugins

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Screenshots

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Host/Environment (please complete the following information):

• OS: [e.g. iOS]
• Browser and version [e.g. 22]

Additional context

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[ananzh]

Close it as resolved