Hi Pavla, thanks for asking!
Adapptio does not work like a graphical editor. You have to use either container or grid layout component. We are planning to add an absolute positioning feature which will allow you to position component on some exact coordinates (left, top) but it's not a recommended approach for most cases. It's mainly because of responsivity and accessibility.
To solve your problem, you can use the container
component with flex configuration like Dem already described.
The solution with grid won't work for all screen resolutions because the grid height is always the same and does not stretch vertically. Which means that one user will have the button on the bottom, other user will have in the middle of the screen and another user will have off the screen.
Is it understandable?