You can disable through the Group Policy:
Start > Run > gpedit.msc > Enter key
Navigate to:
Local Computer Policy > Computer Configuration > Administrative Templates > Windows Components > Windows Update > Windows Update for Business
On the right pane, double-click the “Select the Target Feature Update Version” entry.
A “Select the Target Feature Update Version” window will open. Here, activate the “Enabled” option. Then click the “Target Version for Feature Updates” field and type “21H1” (without quotes) or whatever your preferred release is. Finally, click “Apply” followed by “OK.”