How do I edit text in an Impress text box?

English
#1

I’m editing an interactive powerpoint by my professor she made in Powerpoint 2003 that I edit in LibreOffice Impress. But I can’t change the size of my text, or its color. Only keyboard commands can change emphasis.

How can I edit text in an Impress text box?

#2

Upload your anonymized file to give me a try.

#3

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