Having your wisdom teeth removed does not usually change the shape of your face, so your face will not get smaller.
The size of the face is mainly determined by the shape of the jawbone and the muscles of the face. Wisdom teeth grow on the jawbone and generally have little effect on the overall shape of the face when they are missing, especially when certain wisdom teeth are completely bone-embedded. So the face will not become smaller.
If you feel that your face looks smaller after wisdom teeth extraction, it may be that the extraction of wisdom teeth affects your eating, and the shape of your face may change after a long-term change in the way you chew and the amount of chewing you do.
It may also be that after wisdom teeth extraction, there will be postoperative swelling in the local area and face. After the swelling subsides, you may feel that your face looks smaller.
It is recommended to consult a medical professional on whether your face will become smaller after wisdom teeth extraction.