Where can I find the link icon in Polarion?

Question

I read the tutorials of the demoversion of the Polarion REQUIREMENTS software. On the page How to link, one can read the following: However, I cannot find the link icon. Where is it or why can I not see it?

Answer 1

Closing a sidebar might help.

For example: the Approvals sidebar replaces the link symbol in front of a requirement by other symbols.