number of workspaces in Gnome

Have you try this?

If you right-click the workspace switcher and choose preferences, you can adjust rows and columns from there.

http://www.linuxquestions.org/questions/linux-desktop-74/add-more-workspace-in-fedora-13-a-825426/

Install gnome-tweak-tool (live.gnome.org/GnomeTweakTool). Go to Shell tab on the left. There is "Dynamic workspaces" and workspace number options. Thats the one I use to make such changes on my desktop.

I found gnome-help (see below), which eventually led to a workspaces discussion that revealed these user-privilege (not sudo/root) command line instructions for setting rows and columns:

to set number of columns (in my case, 3), change final parameter:

gsettings set org.compiz.core:/org/compiz/profiles/unity/plugins/core/ hsize 3

to set number of rows (also 3, here), change final parameter:

gsettings set org.compiz.core:/org/compiz/profiles/unity/plugins/core/ vsize 3

The difference for rows vs columns is the next-to-last parameter, either hsize (for columns) or vsize (for rows).

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Breadcrumbs from gnome-help:

Ubuntu Desktop Guide » Desktop › Applications and windows » Windows and workspaces › Workspaces »

Heading: "What is a workspace, and how will it help me?"

SubHeading: "Change the number of workspaces"

Ubuntu 16.04 / gnome 3