Not sure what to imagine with this given I didn't use Azure at the time. Is this like the Windows XP style task menu?

Think Niri [0], but worse, embedded in a web browser tab, and without keyboard navigation.

Here's a somewhat ancient Stack Overflow screenshot I found: https://i.sstatic.net/yCseI.png

(I think that's from near the transition because it has full "windowing" controls of minimize/maximize/close buttons. I recall a period with only close buttons.)

All that blue space you could keep filling with more "blades" as you clicked on things until the entire page started scrolling horizontally to switch between "blades". Almost everything you could click opened in a new blade rather than in place in the existing blade. (Like having "Open in New Window" as your browser default.)

It was trying to merge the needs of a configurable Dashboard and a "multi-window experience". You could save collections of blades (a bit like Niri workspaces) as named Dashboards. Overall it was somewhere between overkill and underthought.

(Also someone reminded me that many "blades" still somewhat exist in the modern Portal, because, of course, Microsoft backwards compatibility. Some of the pages are just "maximized Blades" and you can accidentally unmaximize them and start horizontally scrolling into new blades.)

[0] https://github.com/YaLTeR/niri

azure likes to open new sections on the same tab / page as opposed to reloading or opening a new page / tab (overlays? modals? I'm lost on graphic terms)

depending on the resource you're accessing, you can get 5+ sections each with their own ui/ux on the same page/tab and it can be confusing to understand where you're at in your resources

if you're having trouble visualizing it, imagine an url where each new level is a different application with its own ui/ux and purpose all on the same webpage

Imagine OG Xbox menus, or the PS3/PSP menus.