Follow the instructions in the Handbook under "Revert to factory settings".
If that doesn't work, please ask for help on the Suppport forum - for instance, by using "Help / Ask for Help" from within MuseScoreL give more details of your system - what OS, settings in View / Synthesizer, etc.
Comments
Follow the instructions in the Handbook under "Revert to factory settings".
If that doesn't work, please ask for help on the Suppport forum - for instance, by using "Help / Ask for Help" from within MuseScoreL give more details of your system - what OS, settings in View / Synthesizer, etc.