Most of Leviticus records God audibly delivering statutes and regulations concerning liturgical practice to Moses and/or Aaron. However, there are 3 places of relevance to God's manifestation.

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9:23c-24a  

...the Kabod-YHWH appeared to all the people.

Then fire went out from the Presence of YHWH and consumed the burnt offering...

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YHWH had manifested as fire in Exodus, and here He does again. The Glory of YHWH is equated with The Presence of YHWH, and the fire emanates from the Presence to perform a tangible act. When the people saw this, they yelled out and fell down with their faces to the ground.

→ For background, see Exodus or The KAbod YHWH or Theophany in Torah 

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​​​10:1-2 

Nadab and Abihu [...] presented strange fire before YHWH which He had not commanded them to do.  Then fire went out from YHWH's presence and consumed them, so that they died before YHWH. 

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After the unauthorized concoction was offered by Nadab and Abihu, the fire of YHWH "consumed" them, just as He had "consumed" the burnt offering two verses before. This event was also called "the burning which YHWH burned" (הַשְּׂרֵפָה אֲשֶׁר שָׂרַף יהוה) in v.6.​

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16:2 

I will appear in the cloud over the atonement lid.

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The Father is never visible. This is YHWH speaking, but it is The Kabod YHWH which will become visible there. 

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Leviticus Summary

YHWH is not only the voice who delivers statutes and regulations to Moses and Aaron, but also The Kabod who comes out physically from YHWH's manifest presence to consume a burnt offering or 2 disobedient priests in front of all the people. Those people also came to Moses for an immediate judgment when there was a fight in the camp; they wanted to receive judgment directly from the “mouth of YHWH” (עַל־פִי יהוה) [Lev 24:12]. And God as The Kabod would thereafter appear above the atonement lid within the Most Holy Place once per year.