Hi there 👏 !
Here my own Vivaldi look. Yup, it's colorful cause I'm in love with colors ♥ 🌈.
I'm using "Private" skin of Vivaldi with full rounded corner to look nice.
The background image and tiles images are made with Inkscape only except Dealabs.
Completely different stuff. The context menu example is similar to the editable toolbar feature. First of all, you can leave it as it was, or you can restore the old menus. Second, the context menus were not consistent at all, due to their nature being contextual. On the other hand, the icon set was (mostly) consistent.
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@Komeoww Don't think it is possible since Vivaldi isn't controlling that top bar with HTML and CSS when you use native window.
My suggestion would be to disable native window and recreate the look you want.
Settings → Appearance → Window Appearance
Use Native Window
Three colored circles for the window controls should be fairly easy to replicate, so that would appear to be the best solution.
You can look at this post/ thread to see how I go about changing icons.
@fernandez I'm only a community user, so take my words as pure speculation: in this build some interface areas were optimized - see the active panel button and the speed dials - so probably the feature was "removed" for few builds to accomodate the new fixes. I think will come back soon, but if you really want it now, a mod is the only way (or keep an older build).