Thank you for your prompt reply. I do not use custom Keyboard. I am currently using SfComboBox version 18.3.0.53. Testing on iOS 14.4. Looking forward to hearing from you.
<combobox:SfComboBox x:Name="UserComboBox"
Grid.Column="1"
HeightRequest="40"
DropDownItemHeight="50"
MaximumDropDownHeight="500"
ShowBorder="True"
BorderColor="#D3D3D3"
FontFamily="Lato-Bold"
DropDownCornerRadius="0"
ShowClearButton="False"
DisplayMemberPath="PersonName"
AllowFiltering="true"
IsEditableMode="true"
MultiSelectMode="Token"
TokensWrapMode="Wrap"
Watermark="Search User..."
EnableAutoSize="True"
IsSelectedItemsVisibleInDropDown="false"
SuggestionMode="Contains"
SelectionChanged="OnUserSelectionChanged"
Text="{Binding UserSearchText, Mode=TwoWay}"
DataSource="{Binding UserCollection}">
<combobox:SfComboBox.DropDownButtonSettings>
<combobox:DropDownButtonSettings Width="40" Height="40">
<combobox:DropDownButtonSettings.View>
<Label WidthRequest="30" HorizontalTextAlignment="Center" VerticalTextAlignment="Center"/>
combobox:DropDownButtonSettings.View>
combobox:DropDownButtonSettings>
combobox:SfComboBox.DropDownButtonSettings>
<combobox:SfComboBox.TokenSettings>
<combobox:TokenSettings FontSize="16"
BackgroundColor="#E8E8E8"
TextColor="#333333"
SelectedBackgroundColor="#ffffe0"
FontFamily="Lato-Bold"
DeleteButtonColor="#333333"
IsCloseButtonVisible="true"
CornerRadius="5"
DeleteButtonPlacement="Right">
combobox:TokenSettings>
combobox:SfComboBox.TokenSettings>
combobox:SfComboBox>