Toolbar

Good Afternoon! This is probably an extremely easy fix but I can’t figure it out! I am using the Twenty Sixteen Theme. When I add a paragraph and start adding text the tool bar associated with the paragraph is limited to 8 tools:
Change Block Type
Align Text Left
Align text center
Align text right
Bold
Italicize
Link
Strikethrough

How do I get the other tools to show up? Specifically I would like to have the “Insert Read More Tag” available along with insert text etc. Can anyone tell me how to show all of the items on the paragraph tool bar instead of the abbreviated version?

Thanks in advance for any suggestions!

Toby