It sounds like this hasn't been an issue since Hirsute.
** No longer affects: xscreensaver (Ubuntu)
** Changed in: lxqt-session (Ubuntu)
Status: New => Fix Released
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** Summary changed:
- lubuntu 19.04/19.10 xscreensaver runs on single display, other display
continues normally
+ lubuntu 19.04-20.04 xscreensaver runs on single display, other display
continues normally
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