Why is the source segment automatically copied in my target segment when I use a French accent in the translation (using Alt130)?

Question

Hello, 
 I have an issue with the Trados Studio 2017 program every time I use Alt130 to add a French accent in my translation, for some reason the source segment is automatically copied into the translation. Is there a way to solve this problem? Thank you for your help, 
 Rima

Rima Assouad · Accepted Answer

I was finally able to solve the problem, it was as simple as unlocking the numeral lock...

Trados Studio > 1. Trados Studio

Why is the source segment automatically copied in my target segment when I use a French accent in the translation (using Alt130)?