I set the Super button to open whisker menu.
But, for example when I press Super + F it also opens.
How can I fix this problem?
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First of all Whisker menu is a third party application not developed by XFCE team or Xubuntu. And coming to your issue, Whisker Menu doesn't have ability to bind shortcuts to "Release". That means when you try to initiate other shortcuts involving Super Key, then Whisker Menu also pops up. Hopefully developer of this menu integrates this ability. However there is a workaround though. Create shell script to launch both application and whisker menu. Then bind shortcuts to that script.
You can try using https://github.com/hanschen/ksuperkey to solve this issue. The underlying problem is that keys are set on keypress rather than keyrelease. https://gitlab.xfce.org/xfce/libxfce4ui/-/issues/1