The confirm window closes automatically.

I don't know reason.

my heidisql version is 12.21.0.7344 (64bit)

I solved this problem.

The security programs were the ones causing the problem.

It is happening again.

What on earth is the cause?

table truncate or table delete confirm window closes automatically. why????

You're the second one reporting such a behaviour. Here's a similar thread.

I have yet no clue why this happens. And I cannot reproduce it on my standard Windows 11 system.

Do you probably have some third party app which modifies global Windows features?