Hi Nikoly Soldatkin,
Sorry for the inconvenience.
We have checked the reported issue ”Annoying Problem with position of Picker in SfPicker.UWP”. Generally, In our SfPicker control the picker dialog will be open at the center when the picker mode is set as Dialog We don’t have feature for Alignments of the Picker which mode is Dialog in Picker.UWP platform and also this issue may occur by providing the HeightRequest and WidthRequest value as 1, So can you please try by removing these properties or set the high value for these properties.
We have modified the reported sample and removing the HeightRequest and WidthRequest property now its working fine. Please have the sample from the following link.
Sample:
https://www.syncfusion.com/downloads/support/directtrac/general/ze/Picker_sample5396(new)-846460442
Please let us know if you have any other concern.
Regards,
Mugundhan S.