If you're in a game, you can also press hotkey+Y and that should pull up the RetroArch menu where you can find the "inputs" menu and change the settings to enable the left analog stick to work the same way as your Dpad. If you go to the configuration settings within the same menu, you can set this to "save configuration on exit" and then any games you play on that emulator will have the left analog stick enabled.
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