In order to edit Fibonacci tool, you have to select the object, right-click on it and choose "Fibo properties..." from context menu.
The width of lines is adjusted on Common tab.
Regarding levels showing prices, it is described in built-in help of Terminal (see Analytics — Graphical Objects):
The "Fibo Levels" tab is specifically used only for Fibonacci tools. The list of
the tool levels is given here in form of a table. The values of the levels can
be changed or deleted (the "Delete" button). A new level can be added by
pressing of the "Add" button. At that, if "(%$)" is entered in the "Description"
field, the price value corresponding with this level will be shown in the chart.
There is no feature to color values different colors and it won't be added.