John Gill Commentary Exodus 33:9

"And it came to pass, when Moses entered into the Tent, the pillar of cloud descended, and stood at the door of the Tent: and [Jehovah] spake with Moses." — Exodus 33:9 (ASV)

And it came to pass, as Moses entered into the tabernacle,
the cloudy pillar descended
From the top of the mount in which Jehovah was:

and stood at the door of the tabernacle ;
where Moses was just entered, and in sight of the people, which was a token of grace and favour both to him and them:

and [the Lord] talked with Moses ;
not the cloudy pillar, but the Lord in it, as we rightly supply it: what he talked with him about is not said, very probably concerning the children of Israel, their conduct and behaviour, and what was his will further concerning them.