You may toggle the source subtitles preview:
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When you make a change, a question mark will appear in the upper left corner of the subtitling area. Click it to choose a suitable error code.
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You can use the arrows above the table to go over the changes or display only edited subtitles:
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Click Show editing diff summary to see the log of all the changes you’ve made:
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To download changes' summary as Word or Excel file:
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