Xcode recently updated itself to Version 14.0 (14A309), when it loads, it all looks normal, but eventually all these blue lines appear. 
I have tried changing the setting Editor > Canvas > Bounds Rectangles
Every time I select the Main Storyboard, even if this setting is unchecked, in about a minute, it is automatically checked off and the blue lines reappear. Unchecking doesn't make lines disappear on storyboard. Then I have to uncheck it again, close Main Storyboard and reselect it. And the whole cycle starts again about a minute later.
Seems like a bug in this new version of xcode. Anyone else seeing it?