Issue Summary

This is reproducible on Data Center: (yes)

Since Confluence v8.6, the images resized by percentage  are displayed as small images on the page.

Steps to Reproduce

1. Create a page in Confluence 
2. Download Confluence Source Editor.
   • Go to Settings -> Manage Apps screen and install Confluence Source Editor by selecting Upload app and choosing the Confluence source editor jar file.
3. Edit the page and click the <> button 
4. Insert the storage format below:

   1. <p> 
        <ac:image ac:align="center" ac:width="80%" 
          <ri:attachment ri:filename="image-2023-11-21_11-42-29.png" /> 
        </ac:image> 
      </p>  

1. Save the page

Expected Results

The image should be displayed as expected:

Actual Results

The. image is displayed as a small image:

Workaround

Use pixel values instead of the percentage: 

<p> 
  <ac:image ac:align="center" ac:width="650"
      <ri:attachment ri:filename="image-2023-11-21_11-42-29.png" />
  </ac:image> 
</p>  

Another possible workaround is to use the custom CSS below. This was shown to work in at least two different environments.

.wiki-content .confluence-embedded-file-wrapper.confluence-embedded-manual-size {
max-width: none !important;
}

• See Styling Confluence with CSS.