How can you ensure a popup window is always visible on the screen?

To ensure that a popup window is always visible on the screen, removing the outer layer grid is effective because it allows the popup to be independent of any constraints imposed by surrounding layout components. When a popup is encapsulated within a grid or a layout that has fixed dimensions or scrollable attributes, it may become obscured or scroll out of view when the content height exceeds the viewport size. By removing the outer layer grid, the popup can occupy space freely, which increases the likelihood of it being displayed fully and not obscured by other elements or the edges of the screen. This approach enhances the user experience by ensuring the popup is readily accessible and visible without interference from surrounding layout structures.

Setting a minimum height can also help maintain a certain visibility aspect, but it does not guarantee that the popup remains on the screen, especially on smaller screens. Adding a title bar or keeping it on the main navigation does not address visibility in terms of positioning it on the screen; these methods are more about usability or maintaining a structured layout rather than ensuring the popup itself is always fully visible.