Yes, strange but true. The “Show” checkbox is indeed toggled by the tilde prefix. Once the symbol has been read into the schematic adding a tilde adds an overscore to the text.[quote=“Rene_Poschl, post:6, topic:8263”]
So yes @bobc has the correct answer.
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Yes he does, and his time spent testing and answering is appreciated, but he could chill just a little. He too has a little bit of that “ego thing” he refers to. 
@bobc usually is correct as he often puts in the effort to test things and even post examples, such as his recent illustration of what it takes to get a zone to fill. In my previous post I was not trying to correct him but rather list the uses I know of for the tilde. Although it did come as a surprise that the tilde prefix is treated differently when read from the library. Thank you @bobc!
In any case, does this help the op explain why he now has tildes in his library?