Cannot hide line or change style

Hello, SolidWorks dummy here. I have recently pulled a detailed view off of a model showing a pipe, and I only want to show the outer wall of the pipe. All of the lines come up as hidden because it is below a roof, however it only allows me to change the one side of the pipe to a solid line by changing line style, and it will not allow to hide the inner diameter line on one side of the pipe. I click hide on it several times, or try to change the style, and this line remains a dashed hidden line. Once again, this is a top view of a pipe, I will attach a screen shot to illustrate my issue. Any suggestions?

SolidworksAssemblies