I've erased the in-design and reinstalled it and tried resetting it, but the vertical writing tool doesn't appear.
They're telling me to use it in administrator mode, but if I do that, the composers won't appear again.
Is there any way to get vertical writing even if I use it normally other than administrator mode?
I erased it, installed it, and reset it, but doesn't the vertical writing tool appear?
As far as I know, for vertical text composition you need the Japenese version of InDesign. Do you have that installed?
See the following article