I've already noticed several bugs with this feature. While I love the idea of a controller friendly overlay when using a controller, the current implementation is glitchy and basically unusable.

Most notably, changing steam input settings and controller mappings doesn't work well whatsoever, sometimes changing an option works fine, sometimes it does nothing, sometimes it changes the functionality of the button but doesn't update the UI (which means you don't get, for example, mouse settings for trackpads), Sometimes it does the opposite.

The UI scaling also appears smaller than it does when in big picture mode itself (i have not checked whether my BPM scaling is set different from default, but either way, the controller overlay in desktop mode should scale to match)

I've also noticed, the power menu in the overlay is just a clone of the big picture power menu and a lot of options are not relevant, for example "exit big picture mode" just wont do anything,

on a side note. I've noticed a few issues with the BPM overlay in general outside of the desktop mode. ill add these here instead of making a new topic since they'e related to BPM.

I've found the big picture overlay to be unusably laggy in some situations, both in BPM and Desktop mode. its usually fine on the home screen, but the in-game overlay scrolls to a crawl sometimes and might take multiple seconds to register an input and perform the associated action. this even happens when scrolling through the root overlay menu.

As well as that, pressing the back button (B/Circle) will often just quit out of the overlay instead of returning to the previous window/page/pane. IMO the back button should always be the closest discreet step backwards as possible and should never quit out of the overly entirely (at least without a confirmation). the overlay should only be closed by either pressing the guide/PS button or by clicking resume game.