v0.1.87
The U+ code-point entry is a floating panel now, not a page of the keyboard. Opening it replaces the keyboard with a small pad you can drag and resize; closing it puts back whatever was there before, on the layout it was left on. The pad's close key ends the entry rather than turning floating off.
How see-through it is comes from the floating keyboard's own opacity setting — one preference for panels that hover over your document — while its position and size are remembered separately, because the pad is a different size and belongs somewhere else.
With a hardware keyboard the pad now comes up regardless. That case hides the on-screen keyboard, which used to leave the code you were typing with nothing showing it; the digits, backspace, Enter and Esc all work from the physical keys. Codes run to six digits, so everything up to U+10FFFF is reachable.
Reproducibility re-verified at this tag under JDK 21.