In the Track Inspector the toggle to use it is (I) this will either load it or expand it. If you for example at the top are Clip, Track and Pro Channel. To get to clip properties click in clip and you will have a listing of clip properties. To see the full strip click on the clip tab. The tab work as a toggle. Pro Channel when displayed can go to a the strip view by clicking on the Pro Channel tab again.
If you think of the tabs as toggles it makes more sense.
Below is from page 531 in the User Manual.
To lock the Track Inspector to a specific track or bus Be default, the Track Inspector dynamically updates to show the current track. However, you can
choose to always show a specific track or bus regardless of which track is current.
1. Click the track or bus you want to show in the Track Inspector.
2. Click the Track Name control in the Track Inspector and select Lock the current track or bus
from the drop-down menu.
To unlock the track or bus, select Lock the current track or bus from the menu again.