enter image description here I have to move mouse pointer to icon to get it open
By default, you can use Ctrl+Alt+ArrowKeys to move around between workspaces.
For example, to move one workspace to the right, just use Ctrl+Alt+RightArrow.
These are set in your Keyboard Preferences, which can be accessed by opening your Dash, searching for Keyboard, selecting Shortcuts, and then Navigation.
From here, you can also set hotkeys to move to a specific workplace if you'd rather do that instead of switching one at a time. You can see these at the bottom of the above screenshot (Switch to workspace n).
CTRL+ALT+Arrow key will move between workspaces.