Access Abfrage Schaltfläche Ausführen! deaktiviert

If you are talking about the disabled option to "Run Selected" as shown in your screenshot, then you should know that it applies in SQL view, not in the QBE view. It is part of the Monaco SQL Editor. It allows you to select part of a query and run only that part, not the whole query.

If you are saying that the button itself, and not just the option below it, is disabled, that is a different matter.