Please help
I don't know how to open MacBook after i deleted the disk.
MacBook Air 13″, macOS 10.15
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Click on the top left entry there.
Or try this...
1. Start up from macOS Recovery
To start up from macOS Recovery, turn on your Mac and immediately press and hold the following combinations on your keyboard.
Option-⌘-R
Upgrade to the latest macOS compatible with your Mac.