I have used the Radzen dropdown as mentioned below
<RadzenDropDown Change="@CountryChange" id="SelectCountryEmploymentProfile" Name="SelectCountryEmploymentProfile" class="form-select" AllowClear="true" @bind-Value="@editPartyEmploymentProfileViewModel.CountryId" AllowVirtualization="true"
AllowFiltering="true" Data=@countryMaster TextProperty="CountryName" ValueProperty="CountryId" />
And I'm using it in offcanvas modal of bootstrap but the filter is not working for dropdown. I'm unable to type anything in the search input of dropdown.