If Gboard for Android looks ever so slightly different in recent days, it’s because the button for accessing the various keyboard tools is now themed with Dynamic Color in dark mode.
In dark mode, the 2×2 grid icon was previously not themed. Like the microphone on the right, it was placed in a circle with a slightly lighter background than the rest of the shortcuts in the strip.
That button now shares the same background as the enter key in the bottom-right corner, with ‘?123’ being the other themed button in Gboard (though with a less vibrant shade).
This was already the case when the light theme is enabled (as seen above), but Google has now brought this behavior over to the dark side. It’s not clear if this is an intentional change or a bug.
It’s a small change, but one you’ll absolutely notice. The highlight is presumably meant to convey that you can tap the button to access…
Source 9to5google.com