Front
Front Side
noun
The front face of something is the front or the front side of it (kind of like how 外面 is the exterior because it's the outside face).
ぜんめん
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
ビエトはいつもいい人さを前面に出している。
Viet always puts his good man-ness to the front.
前面も後面も両方とも緑色の箱をさがしてください。
Please find a box that has green on both the front and back sides.
手紙や小包を送る時には、いつも前面にTofuguのステッカーを貼ります。
Whenever we send a letter or a package, we put the Tofugu sticker on the front of it.