This issue appears to stem from a change introduced in Chrome/Chromium versions after 88.0.4324, which affects how the DevTools window renders when using Stetho.

As discussed in this GitHub comment, a practical workaround is to use an older version of a Chromium-based browser. I found that Brave v1.20.110, which is based on Chromium 88.0.4324, works as expected and properly renders the DevTools window when inspecting via Stetho.

You can download that version here:
👉 Brave v1.20.110

Until there’s an upstream fix or compatibility update, this workaround should help restore the expected debugging experience.