When you the mouse over a symbol, a pop-up appears with the symbol and a green arrow next to it. When you click the green arrow, the Select Symbol dialog opens with a list of where that symbol is declared/used/etc. Each time the Select Symbol dialog opens, its length grows. And there appears to no end to how large the width will grow. I often shorten it before closing, but it continues to grow each time its opened. This is not a problem, just an annoyance.
I'm using v23.0.0.11 with hotfix se2300_1 installed.