The project browser can be activated by Tools->Project Browser:
It show all elements of the current program.
To avoid showing also all LiveCode internal program, go to Edit->Preferences->General and uncheck LiveCode UI appear in list of stacks.
Clicking on the eye icon, you set visible or invisible the eye's object.
Clicking on the lock, you lock (you can't modify) the corresponding object.
The blue numbers on the right show the number of code line that the corresponding object contains. This way you can know immediately where is the code.
On the bottom right there are buttons to create or duplicate objects, grouping or deleting them.
On the bottom left there are button to align and distribute object, select multiple object holding SHIFT button to activate them.