Translation comes out on left side- how do I keep it on the right?

Hello!

I find that when I am done with the translation and re-open the file to go over it, the original text is gone on the left and replaced with my translated work and the right side is empty. 

I need both the original and my translation to be seen- the original language on the left and my translated text on the right.  I am not sure why the otiginal text disappears like that.  Any suggestions on how I can keep it all intact?  I am using Trados Studio 2024, translating from Greek into English.  Much appreciated!  Katerina

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