After removing a widget, there is a notification to say it has been removed. This notification does not display a timer, but it does disappear after one minute. This seems like too long, and it should display a timer. KDE Neon Unstable, updated today Plasma 6.0.80 Frameworks 5.249.0 Qt 6.6.1 Wayland
That's because it doesn't time out in the normal way; the idea is to make it stay on screen until acknowledged. The issue here is that it in fact *does* time out, just after 1 minute, rather than a few seconds. That's bypassing the normal timeout mechanism because plasmashell is manually deleting it. We should get rid of this one-minute timeout; it's confusing. I recall filing a bug report about this years ago too.