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Thanks, this was helpful

This post solved the issue for me, thanks. In Xcode 11,there is an alternative for assistant editor, you can click on the icon (which is two vertical rectangles with a plus sign in the 2nd one) found on the right of the assistant editor icon(which is a series of horizontal lines) found at the top right. This displays another editor panel on the right, then you can select the file you want to edit alongside the storyboard and voila, the editor on the right serves as your assistant editor