It wont let me do it
When I choose to reinstall macos, the only disk option is gray, it wont let me choose it. It’s Macinstosh Hd
MacBook Air 13", macOS 10.14
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Boot into Recovery (Command R) and from the dropdown menu: Utilities> Disk Utility> run the First Aid on your Macintosh HD (and the "Macintosh HD-Data" volume as well if Catalina) If errors are found and repaired, run again until no errors reported.
Recovery: https://support.apple.com/en-us/HT204904