Do I need to show my DTV visa document when leaving and re-entering Thailand after a holiday in Vietnam?

A user inquired about the necessity of showing their DTV visa pdf when departing Thailand for a holiday to Vietnam and re-entering. Community members advised that the actual visa pdf may not be necessary when leaving, but it is likely required upon re-entry. It is suggested to keep a printed copy of the visa email for each entry into Thailand, as the visa is registered in the immigration database system, and the passport should suffice for leaving.