When living in Thailand long term, you might hear the term "re-entry permit" floating around. This is a permit for people on a single-entry visa, who want to leave Thailand, but avoid having their visas voided when trying to re-entry Thailand later.

However, given that the new Destination Thailand Visa is a mulltiple-entry visa, you won't need to apply for this. On the DTV, you're allowed to leave and enter Thailand as many times as you want during the duration of your visa.