Most counties in Texas have a standing order that is in place for family law cases. It sets out general guidelines for how the parties to the case should behave with regards to property/use of money, conduct of the parties, personal and business records, insurance, household bills/ documents and evidence and children.
The answer is on a case by case basis. While both parties reside in the home it in inadvisable to change the locks. Regardless of whether you rent or own your home, unless the residence has been designated for the exclusive use of one of the parties, both spouses have a right to use the residence.
Because all property is presumed to be community property until it has been shown to be separate property by clear and convincing evidence. Even property that starts out as separate can become a mixed property and subject to division in the divorce proceedings.