The Messenger of Allah ﷺ forbade sitting with the knees drawn up and wrapped during the Friday sermon while the imam is delivering it.
حدثنا محمد بن عوف حدثنا المقرئ حدثنا سعيد بن أبي أيوب عن أبي مرحوم
أن رسول الله ﷺ نهى عن الحبوة يوم الجمعة والإمام يخطب
[Its chain is hasan] Tirmidhi narrated it in Kitab al-Salah, chapter on what has been said regarding the dislike of sitting in the ihtiba position while the imam is delivering the sermon, hadith no. 514, from the hadith of Abu Abdul-Rahman Al-Muqri with this wording, and he said, "Hasan."