Can my partner enter Thailand with a 60-day Tourist Visa and later opt for a 14-day visa-free entry?

The post discusses the activation of a 60-day Tourist Visa upon entry to Thailand and the possibility of using a 14-day visa-free entry instead. The user seeks clarification on whether they can enter under the 14-day visa waiver first and later activate the tourist visa after a trip, as direct transit is not an option. The comments suggest that typically the existing tourist visa would be used immediately unless the immigration officer permits otherwise, and they also mention the option of purchasing a re-entry permit to maintain the tourist visa's validity.