MacBook Air a2337 startup noise
when I go to settings and turn off startup sound the computer turns it back on by itself.
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Make sure you are updated to the most recent version of macOS. The current version is 11.5.2.
A couple of earlier versions of macOS had an issue where the Startup Sound setting did not retain the what it was changed to.
For example: if the setting was unchecked, checking it would simply revert to unchecked...as well as if the setting was checked, unchecking it would revert to it being checked.
I had this issue as well and updating to the newest version (at that time) corrected it.