Was the Bread of the Presence leavened?

Probably not.

For the Feast of the Unleavened Bread, Ex 12:

15 seven days you shall eat unleavened bread. On the first day you shall remove leaven out of your houses, for if anyone eats what is leavened, from the first day until the seventh day, that person shall be cut off from Israel.

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Eat only unleavened bread for 7 days. Further, De 16:

4a no leaven shall be seen with you in all your territory for seven days.

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Before Passover, Jews engaged in a thorough cleaning of their homes to remove any trace of leaven. This included bread, pasta, and other foods made with leavening agents. Any remaining leaven was either sold to a non-Jew or destroyed. During Passover, only unleavened products, like matzah, were consumed.

Concerning bread offerings, Le 2:

4 “when you bring a grain offering baked in the oven as an offering, it shall be unleavened loaves of fine flour mixed with oil or unleavened wafers smeared with oil. 5 And if your offering is a grain offering baked on a griddle, it shall be of fine flour unleavened, mixed with oil.

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11 “No grain offering that you bring to the Lord shall be made with leaven, for you shall burn no leaven nor any honey as a food offering to the Lord.

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Don't offer any leaven to God as burn offerings.

Nevertheless, leavened bread were called for in some cases. Le 7:

11 This is the law of the sacrifice of peace offerings that one may offer to the Lord. 12 If he offers it for a thanksgiving, then he shall offer with the thanksgiving sacrifice unleavened loaves mixed with oil, unleavened wafers smeared with oil, and loaves of fine flour well mixed with oil. 13 With the sacrifice of his peace offerings for thanksgiving he shall bring his offering with loaves of leavened bread.

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Paul explained in 1C 5:

7 Get rid of the old leaven, that you may be a new unleavened batch, as you really are. For Christ, our Passover lamb, has been sacrificed. 8 Therefore let us keep the feast, not with the old bread, leavened with malice and wickedness, but with the unleavened bread of sincerity and of truth.

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Leaven often symbolized corruption; Unleave symbolized purity.

The instruction for baking the Bread of the Presence was in Le 24:

5 You shall take fine flour and bake twelve loaves from it; two tenths of an ephah shall be in each loaf.

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Was the Bread of the Presence leavened?

It didn't say whether the bread was leavened. However, I am pretty sure that it was unleavened. Leaven often symbolized wickedness.

Grafted In said:

But they represented the 12 tribes
and lighted by the lampstand

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Sure, but how would that connect to the leaven?

DamianWarS said:

v6 "...and you shall set them in two piles..." The image I get is flat bread aka unleavened, since it would probably be difficult to stack 6 leavened loaves.

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NIV:

The Hebrew word did not necessarily mean 'stack'.

Berean Standard Bible: