How to Resize Text Boxes in PowerPoint
If you have inserted a smart graphic in PowerPoint and added multiple text boxes to it, you can resize them together by following these steps:
Selecting a Smart Graphic: In PowerPoint, select the smart graphic that contains the multiple text boxes, which will make the smart graphic with eight resize control points.
Hold down the Shift key and select multiple text boxes: Hold down the Shift key and click on each text box until you have selected all the text boxes that need to be resized. At this point, all text boxes will appear selected.
Resizing textboxes: After you have selected all the textboxes that need to be resized, click on one of the textboxes and hold down the left mouse button while dragging the mouse to resize the textbox. This will resize all the selected text boxes at the same time.
Repositioning text boxes: After resizing, you may need to reposition the text boxes to make them fit better in the Smart Graphics. You can click on any text box and drag them to reposition them.
Finishing the adjustment: After resizing and repositioning all the text boxes, you can release the left mouse button and finish the adjustment.