Bug? Cannot clear the debug window in B4A-IDE

Before I start a new run I try to clear the debug window in the B4A-IDE to see only the new messages. The window clears, everything looks fine. But when the app starts on the Smartphone all the old debug text and log lines are back again in the Debug-Window.

What do I do wrong?

Not a bug. This is how the system logs work. For further discussion start a new thread in the questions forum.