I read on the e-visa for Myanmar:
How does one prove one has sufficient funds for one's period of stay in Myanmar when entering with an e-visa?
There are variety of ways to show proof of funds.
Usually, most countries won't ask in border checks, unless they get suspicious.
Note: Some countries need a minimum amount, for example Thailand when I entered asked me a proof for 20k Thai Bhat, even though I was only there for two days. Malaysia on the other hand didn't ask for umpteen number of times I visited.