Why pdf reader cannot go back and forward in Zotero 7?

Recently, I've found the Back (Cmd+[) and forward (Cmd+]) buttion in "Go" field is grey (cannot be clicked)~
How to solve this issue?
Thx
https://s3.amazonaws.com/zotero.org/images/forums/u10441484/xn8255bwq2hwjhbf4m18.png
  • What are you trying to do with them? Those are always disabled by default. "Back" becomes active when you click an intra-PDF link, and "Forward" becomes active after you use "Back".
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