jQuery/JS Common - Object Structures - positionConfig - collision
Specifies how to resolve collisions - when the overlay element exceeds the boundary element.
You can use the following collision resolution algorithms:
- "flip" 
 Move the overlay element to the opposite side of the target if that side has more space.
- "fit" 
 Move the overlay element to the inside of the boundary element.
- "flipfit" 
 First apply "flip", then "fit".
- "none" 
 Ignore the collision.
To set the collision option, use an object with the x and y fields. These fields specify how to resolve horizontal and vertical collisions, respectively. Alternatively, you can use a string shortcut from the accepted values list.
jQuery
$(function() {
    $("#popupContainer").dxPopup({
        // ...
        position: {
            // ...
            collision: "flip none"
            // ===== or =====
            collision: { x: "flip", y: "none" }
        }
    });
});Angular
<dx-popup ... >
    <dxo-position ...
        collision="flip none">
        <!-- or -->
        <dxo-collision x="flip" y="none"></dxo-collision>
    </dxo-position>
</dx-popup>Vue
<template>
    <DxPopup ... >
        <DxPosition
            collision="flip none">
            <!-- or -->
            <DxCollision x="flip" y="none" />
        </DxPosition>
    </DxPopup>
</template>
<script>
import 'devextreme/dist/css/dx.common.css';
import 'devextreme/dist/css/dx.light.css';
import DxPopup, {
    DxPosition,
    DxCollision
} from 'devextreme-vue/popup';
export default {
    components: {
        DxPopup,
        DxPosition,
        DxCollision
    }
}
</script>React
import React from 'react';
import 'devextreme/dist/css/dx.common.css';
import 'devextreme/dist/css/dx.light.css';
import Popup, {
    Position,
    Collision
} from 'devextreme-react/popup';
class App extends React.Component {
    render() {
        return (
            <Popup ... >
                <Position
                    collision="flip none">
                    {/* or */}
                    <Collision x="flip" y="none" />
                </Position>
            </Popup>
        );
    }
}
export default App;ASP.NET MVC Controls
@(Html.DevExtreme().Popup()
    .Position(p => p
        .Collision(PositionResolveCollision.Flip, PositionResolveCollision.None)
    )
)
@(Html.DevExtreme().Popup() _
    .Position(Sub(p)
        p.Collision(PositionResolveCollision.Flip, PositionResolveCollision.None)
    End Sub)
)If you have technical questions, please create a support ticket in the DevExpress Support Center.