Default size of Style task pane in Word 2016 too small

[Editor]

I can increase the size of the task pane manually, but I'd rather not have to do that every time I open a document. Also, instead of the pane being docked all the way to the right, it's off toward the left and bottom of my document.





In a couple of video demonstrations about this task pane, it opens full-sized and docked appropriately on the right, so there must be some way of correcting this.


Thank you for your help.