According to the statement of the Myanmar Embassy in Bangkok, those who will visit Thailand will be allowed to stay only for 14 visa-free days. Previously, visitors to Thailand were granted 45 days without having to apply for a visa in advance, but from 1 April onwards, they will be allowed to stay for 14 visa-free days. During the period from 1 October 2022 to 31 March 2023, foreigners with a visa-free agreement (including Myanmar) can stay up to 45 days and those with visas on arrival are allowed to stay for up to 30 days. However, those who want to stay longer can apply for a visa at the Royal Thai Embassy in Yangon, as only 14 visa-free days will be allowed starting 1 April.
Source: The Global New Light of Myanmar