After translation a Parallel View is not available. The columns are misaligned and difficult to see.
If you upload a txt. format file, type or paste the text directly, light-mode translation will be activated, so the parallel view and the preview mode will not appear.
If you want to use the parallel view with the preview mode, please upload a file format such as Word.
In the future, we are considering an update that allows you to use the parallel view with preview mode in text translations as well.