Thanks for reporting this issue! We will be removing the categories “Speech bubbles” and “Sound FX” from the library.
For now, I’d suggest searching directly in the music library for a sound effect. If you need a speech bubble to add to the scene, feel free to search directly in the “Animated Sets” category: https://cl.ly/1N2Z2K2y3G0t
Please let me know if you have any further questions.