Drawing sheets & views supressed

[Troy's design]

Hi Forum,
I'm hoping someone can help me here, I'm a fairly new user. In my current drawing the sheets & view icons for some reason have been showing faded.
I believe this means suppressed? I was hoping for any suggestions here as to why this is appearing, thanks in advance.

 

[Cadasio]

Is that not just because you are currently looking at STR?