Trouble resizing text boxes and images from edges in Illustrator

Hi everyone!
I’m having an issue in Illustrator: I can’t resize text boxes from the edges — the same thing happens with photos/images. When I try to drag from the sides or corners, nothing changes. I’m not sure if it’s a setting I accidentally changed or if I’m using the wrong tool.

Has anyone experienced this before? How can I fix it so I can freely make text boxes and images smaller or larger from their edges?

Thanks in advance!