Disabled Mac book air

Activation Lock for Mac - Apple Support describes how it works in general terms. The applicable section is How to disable Activation Lock. Specifically,

If you don't have access to your Mac, use a web browser on another device to remove Activation Lock.

If your previously owned Mac shows an Activation Lock window that asks for someone else's Apple ID, the previous owner may need to remove Activation Lock for you.

If neither one of those options apply, then please write back and identify the specific screen image you are encountering. Use If your Mac doesn't start up all the way - Apple Support as a reference, and describe what happens when you follow the applicable instructions under the screen image that is shown in that document.