It appears that icon is customizable through regular icon theming. It's called 'view-app-grid-symbolic'...
./Adwaita/scalable/actions/view-app-grid-symbolic.svg ./Adwaita/64x64/actions/view-app-grid-symbolic.symbolic.png ./Adwaita/48x48/actions/view-app-grid-symbolic.symbolic.png ./Adwaita/96x96/actions/view-app-grid-symbolic.symbolic.png ./Adwaita/16x16/actions/view-app-grid-symbolic.symbolic.png ./Adwaita/32x32/actions/view-app-grid-symbolic.symbolic.png ./Adwaita/24x24/actions/view-app-grid-symbolic.symbolic.png ./Yaru/scalable/actions/view-app-grid-symbolic.svg ** Tags added: focal ** Changed in: gnome-shell (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1894909 Title: Feature Request: Ability to change "Applications Overview" button style. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1894909/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs