Is it possible to remove, hide or disable the following icon but keep the workspace switcher feature enabled?
dconf-editor ... to install it - execute :
sudo apt install dconf-editor
launcher and click on
In the field
Custom value remove
'unity://expo-icon', and click
Switch between work spaces with key combination : Ctrl + Alt + Arrow-Key
When you want to revert the change, you have two options, either re-add
Custom value or switch
Use default value to
ON and then click on
Note : the second option reverts all launcher icon setting changes back to default though.