Feature: Independent workspaces for each monitor in multi-monitor setups (#5195) · Issues · GNOME / gnome-shell · GitLab
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7.5 Using Workspaces | Ubuntu 20.04 Essentials
software recommendation - Looking for an alternative 18.04 desktop environment that works well with multiple monitors and workspaces like Unity did - Ask Ubuntu
Ubuntu Workspaces: Enabling, Creating, and Switching
Split screen, move windows and maximize on Linux mint/Ubuntu - Softhints