, or Alt+F5
Non-adjacent entries can be marked by clicking the word and pressing Alt+F5. The first one marked will get a green mark in the margin and subsequent ones will get yellow marks.
To undo a specific entry, press Alt+F5 again.
To un-mark all entries, use Shift+Alt+F5.
To lemmatise all marked entries, press F4 after marking.
See also: merging timelines