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By default, the size of tiles is  is proportional to  to the video resolution.

To fix the size and expand tiles to all free space on the layout area, do as follows:

1. Go to Settings → Options → User interface User Interface (1–2). 
2. Uncheck the Adjust video frame border checkbox checkbox (34).
   
3. Click Apply to save the changes.
4. Reopen the Layout (see Layouts Management).

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