Text widget gets stuck inside a column

Hi, I am new to flutter and exasparated with the coding involved to design the UI. So I chanced upon flutterViz. I made a container . Put a column widget inside and dragged a text widget inside the column. Now I wanted to move the text widget to another location within the column . I tried Right clicking and moving it down and up but it remained stuck in its position. Now this is going to be my basic requirement in all flutterViz projects . So please if anybody has a solution , do help me

Regards

Sanjish