Hi Jude
If you want to resize and move content on a page you can use Control + A or Command + A to select all of the content on the page then you can drag the object to a new desired location and resize it to your desired size using the white boxes in the corner.
Also if you don't want to select every single shape on the page but still want to resize multiple shapes simply click and hold on an empty part of the canvas and then drag your mouse over your shapes to highlight the shapes you want to move and resize. Anything within the box will be highlighted.
I hope this helps! Let me know if you have any other questions and I would be more than happy to help.