that's from the Edge classic
Now Fixedand here below is the one from Edge insider Canary
Version 79.0.299.0 (Official build) canary (64-bit)
Notice how bad the text colors are in dark them.
It's a little better on the light theme.
also Edge insider needs the page themes from Classic Edge, they have nicer colors
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Update: Version 80.0.316.0 Canary
After - Now in Version 80.0.316.0 Canary
After - Now - Version 80.0.316.0
Everything from Edge classic's Reading view mode (even more new features) is now available in the new Edge browser.
the final piece was added today in latest canary Version 80.0.351.0 (Official build) canary (64-bit)