Hi,
How did you disable the Windows search service in Citrix servers? Did you disable the Windows Desktop Search 4.0 or above system component? Could you please provide a screenshot about this warning message?
Generally, we can use the following Group Policy setting to prevent a dialog box from being shown when the Windows Desktop Search 4.0 or above system component is not present on the user's computer:
Go to User Configuration | Administrative Templates | Microsoft Outlook 2016 | Outlook Options | Preferences | Search Options. Enable the setting "Prevent installation prompts when Windows Desktop Search component is not present".
Update the group policy setting to apply it.
Regards,
Winnie Liang
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