1.Close Trados Studio
2.Go to C:\Users\%username%\AppData\Roaming\SDL\SDL Trados Studio\Studio16 (Note: the location may vary depending on the version of Trados Studio owned)
3.Open the "UserSettings.xml" file found there in a text Editor
4.Search for "AutopropagateDialogLocation"
5.Modify the values there to be: 0; 0
6.Save the file and reopen Trados Studio
Test if the Autopropagation window is now visible. Please keep in mind that these are the settings for a standard screen setup, results may vary depending on each user's settings.