I'm assuming you mean for the device names and Watch/Listen?

Single click the Device name on the left tree.

Choose properties tab on the right and edit the Device name properties and then hit enter.

The device will now have upper/lowercase if you set it that way and will show that on the watch/listen page and when the device is active.

You can do this with Watch/Listen as well and obviously rename them to what you want.

To my knowledge you cannot rename command buttons with lowercase, only what shows up in the left tree.