Hello Stefan,

Unlike other popup components, the AnimationContainer renders at its place of declaration and doesn't have an anchor:

Comparison between all Telerik Blazor popup components

This makes the AnimationContainer's positioning mechanism rather different. As a result, features like boundary detection or fit/flip collision avoidance may be ambiguous or infeasible to implement in a universal manner.

My advice is to measure the screen size (for example, with MediaQuery) and adjust the dimensions and position parameters of the AnimationContainer accordingly. Or, consider a Popup component instead, which is a "true" popup component, because it's not rendered in-place.

Do you have a special reason to use an AnimationContainer in your case?

Dimo
Progress Telerik