Hello @saibalakrishna7799,
Thank you for your patience. To mitigate the stacking opacity; you can adjust the BlendMode property on the annotations affected.
You can find the API doc for this property here: Apryse WebViewer Class: Annotation
For your convenience, there is also an additional forum post which has a similar issue here: https://community.apryse.com/t/overlapping-rectangleannotations-cause-opacity-stacking-and-unreadable-text/12518/4
Feel free to look at the solution provided there for an example on the expected behavior.
Best Regards,
Jacob Romano Carlsen
Web Development Support Engineer
Apryse Software Inc.