With Android 10 Google has killed the support for hardware menu buttons in legacy apps. This is bad news for certain apps, such as Nesoid (NES Emulator for Android), which are not maintained anymore. It means you can no longer tap the overflow menu button in the navigation bar that was still shown on Android 9 to reveal the options menu inside the app.
There are some helper apps such as Menu Button (No root) but these may be cumbersome in day-to-day use since you have to switch your input method in order send the menu key to the app.
Fortunately, App Cloner 2.3 offers a new navigation option called Long-press Back for options menu, which allows long-pressing the standard Back button in the cloned version of the app to open the app’s options menu.
A fairly simple solution.