On the Edge Chromium browser the 1Password extension is hardly visible.
1Password Version: Not ProvidedExtension Version: Not ProvidedOS Version: Not ProvidedSync Type: Not Provided
This is a known issue with dark mode, but I do not have anything to share at this point.
1Password X should look okay, so you can give it a try. If you have other questions, feel free to raise them. Thank you!