There is an update for this migerh extension. You can download it here:
https://bitbucket.org/migerh/workspace-grid-gnome-shell-extension/downloads
Download workspace-grid@mathematical.coffee.gmail.com-for-3.10.1.zip and extract it to ~/.local/share/gnome-shell/extensions .
You might want to restart Gnome by pressing Alt+F2 , then typing r and pressing Return . I did not understand how to get a new version of an extension without this.
Now you can activate the extension of the workspace, as usual.
You must also enable static workspaces in the gnome-tweak-tool to take full advantage of the extension if you haven’t done so already: launch the Tweak Tool, go to the Workspaces tab and set the “Workspace Creation” to “Static”, and “ Number of workspaces "to the number you need (6).
Now you only need to pay a little attention when the original extension of the mathematical code is updated. When this happens, you probably want to return to the official version.
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