If you want the order status not to automatically notify the client and the site administrator (we need this when changing technical statuses), you need to make the following changes to the file
Find the fragment (approximately from line 66):
And delete the checked=“checked” keys
/design/backend/templates/common/select_popup.tpl
Find the fragment (approximately from line 66):
PHP:
{hook name="select_popup:notify_checkboxes"}
{if $notify}
[LIST][*]
if} onclick="Tygh.$('input[name=__notify_user]').prop('checked', this.checked);" />
{$notify_text|default:__("notify_customer")}[/LIST]
{/if}
{if $notify_department}
[LIST][*]
if} onclick="Tygh.$('input[name=__notify_department]').prop('checked', this.checked);" />
{__("notify_orders_department")}[/LIST]
{/if}
And delete the checked=“checked” keys