I wanted to let you know that the window issue is still present, and I apologize for not being more precise before.
The window works correctly when there is no background. However, as soon as a background is set on the right column (where the visual skill tree is displayed), the confirmation window does not appear when pressing the button. If the background opacity is reduced, the window starts to become visible, which shows that it’s being rendered behind the background instead of on top of everything.
That’s the exact issue I’m seeing.
Sorry again for the confusion earlier, and thanks as always for your time and support.