The list of actions available in the toolbar consists of:
Save action - it allows you to save the content of the left editor when it can be edited.
Perform files differencing - used to perform files differencing on request.
Go to first modification - used to navigate to the first difference.
Go to previous modification - used to navigate to the previous difference.
Go to next modification - used to navigate to the next difference.
Go to last modification - used to navigate to the last difference.
Copy change from right to left - this action copies the selected change from the right editor to the left editor.
Copy all non-conflicting changes from right to left - this action copies all non-conflicting changes from the right editor to the left editor. A non-conflicting change from the right editor is a change that does not overlap with a left editor change.
Show modification details at word level - because the differences are computed using a line differencing algorithm sometimes is useful to see exactly what words are different in a changed section.
Show modification details at character level - useful when you want to find out exactly what characters are different between the two analyzed sections.
Ignore whitespaces - Enables or disables the whitespace ignoring feature.
These actions are available also from the Compare menu.