I have a problem

I want to ask something about app inventor and codes. When I add a text box etc in the app inverter and codes, it throws the text box in the upper left corner, but I want to put it in the middle or somewhere else, how can I do this, by the way, I'm a subscriber, new videos come.

You will have to change the screen's alignment, in its designer properties

Set the screen's vertical and horizontal alignment to center.

You can also use vertical and horizontal arrangements, and labels, to assist with placement and positioning.

Not in production yet, but there is an "Absolute Arrangement" on the way, which will allow for component positioning by co-ordinates.