I have been using the #enable-force-dark flag (found under edge://flags for Microsoft Edge) for a while, and all websites, including Google Docs, were working perfectly fine then—but ever since Google Docs updated something about how document pages, and their color, are setup this past month I can't get documents to darken (regardless of which drop-down edge://flags/#enable-force-dark selection is made), even if I change the page color to dark on Google Docs. Any workarounds within the website itself, Microsoft Edge, and/or another browser?
Note: if I turn the browser flag off, dark document page colors show up perfectly fine, but I would really appreciate avoiding eye strain both on Google Docs, and in other websites.
Best Answer
According to your description, I tried this feature, and I found that #enable-force-dark works normally in Chrome(verion 96.0.4664.45) and Edge(version 96.0.1054.43). In Google Docs, except for the document part, the background is dark, something like this. So I think this is by design.
If this feature does not work correctly, you can try to reset Edge/Chrome or clear the cache, which may be useful to you.
In addition, I found an extension named Dark Reader, I think it will suit you, you can set the level of background color according to your preference. It also works with the document part in Google Docs, and you can even switch back to the default background without restart the browser.