It would open a lot of possibilities, if you could use cards (or sections) as more info popup - so if you click an entity, a card (or stack of cards) opens as popup instead of the default more-info. At the moment this is only possible with browser mod, but that’s a hacky solution without an editor. Something similar you can do with Bubble Card, but that has a different style and AFAIK is limited to its own “cards” (buttons, sliders, …) and is also kind of hacky (not the developers fault).
With cards/sections as more-info popup, you can easily create your own UI for devices. For example you tap on your TV media player and a remote UI pops up. Or the camera has a popup with live feed and PTZ controls.
I would also wish for this, as it would allow me to keep my dashboard clean and minimalistic eg. with one entity card for dishwasher status and hidden in a popup all kinds of extra info about it like the program, running time, energy usage, etc etc.
In my opinion, the layout of the popup could be the same as the more info popup, with the close button and configurable title and the body could be a simple layout like a vertical stack card where we then put our cards in.
One card was just the minimum I wished for, since then it’s possible to add a vertical stack or grid card.
I really like the idea of an entire subview as a popup. The width should then of course depend on the number of columns. So one section column would be similar to the size of the more-info popup.
I like the idea of a subview as popup, because it would bring a lot of flexibility, but I think that most of the time I’d try to keep it rather small. So it would not be worth creating a full screen subview for that.
But even if people use it to create really big subview popups: Opening a popup and closing it is something totally different then navigation away and back (where you probably also loose scroll position) in terms of UX. On slow devices, navigating back is also a lot slower than closing a popup.
@Ildar_Gabdullin This is what I use at the moment. But it’s really not the greatest solution. Also it comes with a lot of other features I don’t need - I liked it better when it was just this: GitHub - thomasloven/lovelace-popup-card.
@smartin I think bubble card is a better solution than browser mod, but the style doesn’t fit the rest of HA and it is still a little bit hacky (especially if you want the style it similar to the rest of HA). I especially don’t like that the card is extended to the bottom of the screen (with a lot of blank space).