First Person: enter this mode to walk around the track using a keyboard and mouse. (There is a decade old bug in Chrome, when you rotate over 360 degrees the screen might jump a bit. Depends on the system.)
Map: rotate around a green center, which is placed on the floor
- Drag: move the track around, thereby moving the center
- Ctrl + drag or right mouse drag: rotate around the center
- Scroll up / down: zoom in / out
- On touchscreens you can move with single finger drag, and zoom/rotate with pinch / double finger drag
Drag: coming from the map mode you can drag the skaters around on the track.
Gamepad: try hooking up your gamepad. You can move/look with the analogue sticks and increase/decrease with the X / Y buttons (depending on the layout)

Import / Export

Open Track: open a previously exported JSON Track Data file
Save Track (Save link as): Export the current Track as a JSON file. This is a link, so you can right click or hold tap and then choose "Save link as" to store the file and choose a filename. It will also download if clicked, but you can't choose the filename.

Library

Open Library: open a previously exported Library JSON file. This gives access to the Library Editor and Sequence Controls.
Close Library (when library is loaded): clears all sequences and descriptions from the current library.