Sample document with problem?
How to attach a screenshot or file in this forum.
There is a recent bug in Word that removes the ability to resize using the mouse/trackpad. MS knows about it and it is likely that it will be fixed at some point.
1. It has to do with documents that are in "compatibility mode." If you change to the latest format, these tools work.
2. You can use the ribbon tools under the Format tab to make changes.