Does anyone else have a problem with not being able to see the full list of columns when you do this?Not me.
There are too many to fit the length of the window, no matter how I change things.True. Increasing the size of the browser viewport won't help you see the entire list, but you can scroll up within the frame:
Also, is Gear an option for adding to the Activity screen?No. It makes sense that there is no such column, since you can assign multiple items of gear (including multiple pairs of shoes) or none at all to a single activity, so there is no single numeric value, or select-one-from-many text label to list.
I want to be able to see which shoes I have assigned to which running activity.Then you either go into each activity individually, or work backwards by going to the Gear page, then click on the Activities link under each item: