Hi Thomas,
The popup menu should not be empty. If it is empty that means something is likely amiss with your PxPlus install.
1) What version of PxPlus are you using?
2) Are you using an updated PxPlus EXE or the PxPlus EXE that shipped with the PxPlus install?
3) What is the contents of the locale folder under your PxPlus install directory? You should see a bunch of .pak files and you should find one that matches your system language also make sure the en-US.pak is there.
4) If using PxPlus 2019, are you setting BrowserLang in the PxPlus INI file or via 'OPTION' mnemonic? If using PxPlus 2019 and not setting BrowserLanf it defaults to the user OS language. If using earlier versions of PxPlus it always uses English.
Answering the above should help with figuring out the cause of the issue.
There is currently no way to disable the popup menu but I suspect you only want that because it display nothing.