@Santosh J - Thanks for the question & using MS Q&A platform.
Note: This is not a bug in Azure Data Factory. This issue would happen when your browser zoom size is set to below: 100%.
As per my repro, I was set my browser zoom size to below: 100% then I was experiencing the same issue as shown below:
When I changed set my browser zoom size to or above: 100% - it was working fine.
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