Virtual keyboard appears unexpectedly

[ynakane]

Hi.
I'm using WebAssembly to develop an application for tablets.

When running an application on a tablet and interacting with the screen, the virtual keyboard appears unexpectedly.
Oddly enough, this behavior varies slightly from device to device.

I am using Qt version 5.15.
I heard that it has been improved in the latest version.
However, I would expect to have control over the virtual keyboard not appearing.
Is there a way to disable the virtual keyboard by coding without changing the Qt version?