Lost storage space on my mac after deleting partitions

Hey there MaceMayer,

Thanks for reaching out to the Apple Support Communities. If wanting to erase all the content on your MacBook and reset it to factory settings, check out the steps in the following resource that can help: Erase your Mac and reset it to factory settings - Apple Support

Use Erase All Content and Settings

This feature requires macOS Monterey or later and a Mac with Apple silicon or the Apple T2 Security Chip. Learn what to do if you can't use Erase All Content and Settings.

macOS Ventura

1. From the Apple menu  in the corner of your screen, choose System Settings.

2. Click General in the sidebar.

3. Click Transfer or Reset on the right.

4. Click Erase All Content and Settings. Don't see this button?

macOS Monterey

1. From the Apple menu  in the corner of your screen, choose System Preferences.

2. From the System Preferences menu in the menu bar, choose Erase All Content and Settings. Don't see this option?

After choosing Erase All Content and Settings, follow these steps to continue:

1. An erase assistant asks you to sign in with your administrator credentials. Enter the password that you use to log in to your Mac, then click OK. Forgot your login password?

2. If you're asked to back up your Mac before resetting it, you can open Time Machine and back up to an external storage device. Or click Continue to proceed without making a new backup.

3. Click Continue to allow your settings, media, data, and the other listed items to be removed.

4. If you're asked to sign out of Apple ID, enter your Apple ID password and click Continue. Forgot your Apple ID password?

5. Click Erase All Content & Settings to confirm that you want to proceed.

6. Your Mac restarts and shows a black screen or progress bar. If it needs to reconnect to a Bluetooth accessory such as a keyboard or mouse, you might be asked to turn on the accessory. If the accessory doesn't connect within 30 seconds, turn the accessory off and back on. When reconnecting to a Bluetooth keyboard, you're asked to choose a language.

7. You might be asked to select a Wi-Fi network or attach a network cable. To select a Wi-Fi network, use the Wi-Fi menu  in the upper-right corner of the screen. 

8. After joining a network, your Mac activates. Click Restart.

9. After restart, a setup assistant guides you through the setup process, as if you're setting up your Mac for the first time.

If you're not using a MacBook with macOS Monterey or later, check out the steps in these next resources for additional help:

• Use Disk Utility to erase a Mac with Apple silicon - Apple Support
• Use Disk Utility to erase an Intel-based Mac - Apple Support

Keep us updated on the results.

Take care!