melonDS-android VS NooDS-PSP

I'm not sure it's possible. I had the same problem. You can only hide it completely or change position to the top. but without a gamepad you can't Access settings in-game. If it really bothers you, you can change to MelonDS which is free. (Last updated July https://github.com/rafaelvcaetano/melonDS-android/releases ) I think Drastic developer kind of abandoned the project, since he haven't updated it for 8 months now (I paid for it as well).

MelonDS

MelonDS|Free|Great Compatibility

Ah, you're using the Android version of melonDS? Yeah, the latest version allows managing DSi titles. The PlayStore seems to have it updated already, or you can just grab the .apk from the GitHub page. However, you may not need it.

And to add MelonDS android also supports Retroachievements

I haven't tried it but MelonDS can apparently run DSiWare.

You can download it from here... Its in the artifacts at the bottom of the page https://github.com/rafaelvcaetano/melonDS-android/actions/runs/4864538207

You're in luck! I recently did this for my Surface Duo. There's a nightly build of MelonDS you can build and install which has RA support. Works very well! https://github.com/rafaelvcaetano/melonDS-android/actions/workflows/main.yaml

Drastic https://play.google.com/store/apps/details?id=com.dsemu.drastic is the best choice for DS emulation. It's paid but it genuinely is worth the money. There is also MelonDS https://github.com/rafaelvcaetano/melonDS-android but it's not quite as good but can play DSi games where Drastic cannot.

There's a standalone app for MelonDS.