I was taught that leaving your shoes facing in is good manners when you go in someone's house.
この場合、次のような言い方ができますよ。
ーI was taught that leaving your shoes facing in is good manners when you go in someone's house.
「人の家に行く時、靴を室内に向けて脱ぐのが良いマナーだと教わった」
to leave one's shoes facing in で「靴を内側に向けて置いておく」
ご参考まで!