Another senior moment - Qt not clearing old projects runs...
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As I mentioned in another post - I am not sure if I changed something or "new version" did...
It really does not matter "who done it , with what ".
Where do I verify / change to delete the older projects runs from "application output".
It should go away when the current run is terminated / exited ...
( I hate unnecessary clutter )BTW - I posted a bug long time ago - when I ask to "terminate / delete all "tabs" " I should NOT have to do it over again for each "tab:...

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Go to Edit -> Preferences -> Build & Run -> Application Output and check "Clear old output on new run".
As for multiple tabs - right click on any of them and select "Close All Tabs".