When I go back to edit text in a text box and want to add something to the end of a line, I press tab and the entire line indents as if I had pressed tab at the beginning of the line instead of the end. Is this normal?
Yes this is normal.
Use alt tab to enter a tab stop, you may also want to use left indent formatting for the tab to correctly
( Inspector > Text > Alignment; and click the left indent button)
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