Thank you Raghu and all, for your help.
I have done as per Raghu's suggestion. Mine is a unbound control with Boolean type.
I have extended the standard object and changed the NeedPermission to Manual and created a new privilege and set the control Grant property as NoAccess. But this is throwing an error as below.
[AxSecurityPrivilege/BHSVendorSearchRestriction/VendSearchCriterion/Controls/EmployeeThatAreVendors/Name]:The NeededPermission property of the 'EmployeeThatAreVendors' control in 'VendSearchCriterion' form is set to 'None'. INC16186_2019 (CUS) [BHGSuite]K:\AosService\PackagesLocalDirectory\BHGSuite\BHGSuite\AxSecurityPrivilege\BHSVendorSearchRestriction.xml'
But I tried this with Newly created control in Extended object, it is working. But not working on standard control.
Can you please help me.
Thanks
Satish