what is the eventual way to display a popup "panel" under/beside an arbitrary @Composable. There once was a DropdownPopup but it was removed as I read. is there a "current" solution to do an arbitrary Popup directly beside a @Composable ?

Do you want it to fit in the window bounds, or do you want it to go outside of the window bounds?

inside window bounds

Popup

composable is still there

you happen to have a pointer to some example code?

https://android.googlesource.com/platform/frameworks/support/+/refs/heads/androidx-main/c[…]rc/commonMain/kotlin/androidx/compose/ui/window/Popup.kt + https://android.googlesource.com/platform/frameworks/support/+/refs/heads/androidx-main/c[…]src/main/java/androidx/compose/ui/samples/PopupSample.kt

just out of curiosity on you first question in this thread here: is there a popup, that can be placed outside the window???

In the desktop world you would use a combination of

JWindow

and

ComposePanel

ah, going down the swing road

Same in Android - popup is expected/actual with

AndroidPopup

using the platform's APIs (window manager, etc)