The bottom toolbar shows the state of the sketch and objects in the sketch. The tool bar contains buttons for changing the state of selected objects, and moving to another View.
Buttons on the bottom toolbar only activate if they can be used. For example, the font button will be inactive if you have an arrow selected.
The toolbar is arranged as follows :
Views
View navigation : Select views from the list
Rename view
Previous view in list
Next view in list
Add view
Search for a view
Hide/Show
Show the sketch hide level
Hide level up/down
Appearance
Font
Font size
Font color
Bold
Italic
Underline
Strikethrough
Object outline color
Object fill color
Object shape
Arrow style
Arrow polarity
Arrow color
Set hide level