On the latest (and not latest) syncfusion kit version the below is not resolved as per 2 most recent comments there.
Please address the issue.
I tried setting the Font for SfComboBox and Entry, entry worked fine, SfComboBox ignored.
SfComboBox resource:
<Style TargetType="combobox:SfComboBox">
<Setter Property="FontFamily" Value="{StaticResource FontFamily-Regular}"/>
<Setter Property="HeightRequest" Value="{x:OnPlatform Android=50, iOS=20}"/>
<Setter Property="TextColor" Value="Black"/>
<Setter Property="TextSize" Value="15"/>
<Setter Property="VerticalOptions" Value="Center"/>
<Setter Property="DropDownItemFontFamily" Value="{StaticResource FontFamily-Regular}"/>
<Setter Property="NoResultsFoundFontFamily" Value="{StaticResource FontFamily-Regular}"/>
</Style>
I have tried on 3 different versions including 18.3.0.48.
Please check the below link.
https://www.syncfusion.com/feedback/14864/provide-support-for-embedded-resource