These pages suggest it is intentional:
http://gregcor.com/2011/05/07/fix-dual-monitors-in-gnome-3-aka-my-workspaces-are-broken/
https://elementaryos.stackexchange.com/questions/2732/workspaces-seem-to-only-apply-to-the-primary-display-is-this-a-feature-or-a-bug
It is certainly frustrating. I had expected independent workspace
control on each monitor.
** Changed in: gnome-shell (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1767564
Title:
Ubuntu 18.04 Workspaces only change on primary monitor
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