There are no associated settings or permissions for that search box. It should always be there.
It's probably a bad template, bad file, or some customization.
1) Visit /install and click the button to rebuild the master data. That will restore the original master templates in the Admin CP which may fix the problem.
2) Run a file check and upload the original files as necessary to fix any errors:
Admin CP -> Tools -> File Health Check
3) Try disabling your addons from the home page of the Admin CP to see if that fixes the problem.
<li class="separated Popup" id="AdminSearch">
<a rel="menu" class="PopupControl PopupOpen" accesskey="f">البحث<span class="arrowWidget"></span></a>
</li>
<li class="separated Popup" id="AdminSearch">
<a rel="menu" class="PopupClosed" accesskey="f">البحث</a>
</li>
yes i put this in configCan you replicate this with add-ons disabled?
Then I suggest creating a support ticket with your URL and login so we can take a look:
https://xenforo.com/customers/support
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