I am using the following list of page sizes for the Pager:
private static readonly List<int?> _pageSizeSelectorItems = new (){ 5, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 40, 50, 60, 70, 80, 90, 100 };
The dropdown is not appearing into the correct direction and overflows the screen.
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ADMIN EDIT
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A possible workaround for the time being is to set some max height to the inner element of the PageSizes dropdown. You can achieve that with CSS. Thus, when the list is longer, the popup will keep that max height and a scrollbar will appear. For example: https://blazorrepl.telerik.com/mcEiYSFO39g6rfSE36.