Hello,
In the future please create topics using the template provided.
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I cannot reproduce this, the measurement fades out when hovered on all annotation tools. Make sure you are using the latest version
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Which version of PDF.js Express are you using? The zoom in issue should be fixed in 7.1.2.
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Are there any errors when loading these documents? I have a feeling this might be related to #2 so try upgrading.
Thanks!
Logan