Hello im0.
Thank you for using Apple Support Communities. If you're looking for information on how to change audio settings for your AirPods, we can share some helpful resources that have steps and information on how to make those adjustments: Change the settings of your AirPods and AirPods Pro - Apple Support & Change settings for AirPods Pro - Apple Support
Adjustable settings include the following: Noise Control, press-and-hold action, Automatic Ear Detection & microphone settings.
There isn't an option that allows you to disable the sound your AirPods make to confirm they're connected to your device. We do recommend that you leave Apple feedback on things they can change or update here: Feedback - AirPods - Apple
Thank you for using Apple Support Communities. Best of luck.