Whenever, I Highlight a part of source segment it is automatically copied to the vis-à-vis target segment.

Question

Hello, I'm currently using SDL Trados Studio 2017. My problem is, whenever, I Highlight a part of source segment it is automatically copied to the vis-&agrave;-vis target segment. 
 However, I tried to find a solution via many sources like Proz and alike. Additionally, I tried in vain the following steps: Tools > Options > Editor > Automation and unchecked the "Copy source when no match is found". How can I get rid of this? Regards, Mukhtar

Nora Díaz · Answer

Hi Mukhtar, Does this happen when you do some specific actions after selecting the text? Have you changed your shortcut for Copy Source to Target by any chance?

Trados Studio > 1. Trados Studio

Whenever, I Highlight a part of source segment it is automatically copied to the vis-à-vis target segment.