There is information about this in the Help files. You may search for “Introduction to Source Language texts” and this will give you further links.
The little box at the top that shows which project is the active one, allows you to select Hebrew or Greek. Depending on the Biblical book you are in, you will see either the Hebrew or the Greek. For the Greek, you can get the UBS Greek NT or you can select the Byzantine text in the View menu. For the OT, you can get the LXX or the Hebrew (or both in two different windows.)
If you right click on a Hebrew or Greek word, you can open various dictionaries, including plants, animals and human-made things if the word at the cursor is one of these. Some words have a link to the Semantic Hebrew dictionary. It is also easy to get a list of all occurrences of a specific word within the current book or all books.
Iver+Larsen