Jetpack Compose TextField in ModalBottomSheetLayout, keyboard won't hide automatically

If hide the bottom sheet by drag gesture then keyboard won't hide automatically

How can I fix it?

Since you haven't shared any code here, this is how I would have handle this issue:

Use the Disposable Effect and onDispose handle the keyboard hiding

Sample Code:

...
val keyboardController = LocalSoftwareKeyboardController.current

  DisposableEffect(key1 = modalBottomSheetState.isVisible, effect = {
        onDispose {
            keyboardController?.hide()
        }
    })
...

The LocalSoftwareKeyboardController is marked as Experimental so you can also do the following:

...
 val focusManager = LocalFocusManager.current

  DisposableEffect(key1 = modalBottomSheetState.isVisible, effect = {
        onDispose {
             focusManager.clearFocus()
        }
    })
...