If you just wanted to cap off 1 sprinkler head, all you had to do is unscrew the head and lowes sells a pvc bolt/or cap that would screw into were you just removed the head. This doesn’t impact anything else on the line.
A bigger concern is the head your want capped off, how will your lawn around the patio get watered? Will the existing heads cover all your lawn/shrubs or will you have gaps?
In the past, when I added a concrete pad/hot tub/fence that would disrupt the flow of the sprinklers, I would have to reroute the pipe or sprinkler head to conform to the new layout. This is also easy to do with sprinkler extension pipe sold at lowes
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