Swift version: 5.1
All table view cells have a separator underneath them by default, and that separator likes to start a little way from the left edge of the screen for stylistic reasons. If this clashes with your own personal aesthetic, you might think it's easy to remove but Apple has made the matter quite confused by changing its mind more than once.
If you absolutely, definitely want to remove the separator inset from all cells, you need to do two things. First, add these two lines of code to your table view controller's
tableView.layoutMargins = UIEdgeInsets.zero tableView.separatorInset = UIEdgeInsets.zero
Now look for you
cellForRowAt method and add this:
cell.layoutMargins = UIEdgeInsets.zero
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Available from iOS 8.0
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.