Governor Abbott has issued an executive order reconfirming that no school district may require any person to wear a mask.  (7/29/21)
“4. To further ensure that no governmental entity can mandate masks, the following requirements shall continue to apply: a. No governmental entity, including a county, city, school district, and public health authority, and no governmental official may require any person to wear a face covering or to mandate that another person wear a face covering; provided, however, that: i. state supported living centers, government-owned hospitals, and government-operated hospitals may continue to use appropriate policies regarding the wearing of face coverings; and ii. the Texas Department of Criminal Justice, the Texas Juvenile Justice Department, and any county and municipal jails acting consistent with guidance by the Texas Commission on Jail Standards may continue to use appropriate policies regarding the wearing of face coverings.”

https://gov.texas.gov/uploads/files/press/EO-GA-38_continued_response_to_the_COVID-19_disaster_IMAGE_07-29-2021.pdf