Hi Safi bro,
As of Wolfram 14.1 on Windows, the ✓ button in the natural-language Quantity input box is currently mouse-only, and there isn’t a built-in keyboard shortcut to accept the interpretation directly.
A practical workaround is to press Ctrl+Enter again after the interpretation is displayed, which sometimes automatically inserts the quantity into your notebook. Another option is to use the arrow keys to navigate and Enter to confirm if the focus is on the interpretation, though this may depend on your specific front-end settings.
It’s a useful feature request, so you might consider submitting feedback via Help > Feedback in Mathematica to suggest a dedicated keyboard shortcut for accepting natural-language interpretations.
This should help speed up workflow if you frequently use Quantity input.
Hope it helps you brother.