Hello hasib ullah,
Bijoy Bayanno is a third-party app from Ananda Computers, so Microsoft doesn't maintain or support it directly. The behavior in the search bar lines up with what Noor mentioned — the older input method doesn't always reach modern input fields cleanly. Running as Administrator and disabling other Bangla keyboards is worth trying, but if the search bar still misbehaves, that's app-side and best raised with Ananda Computers / Bijoy support.
For a fully Microsoft-supported path, Windows 11 ships a built-in Bangla (Bangladesh) keyboard that works across modern apps, including the search bar:
- Settings > Time & language > Language & region > Add a language > Bangla (Bangladesh)
- Switch with Win + Space