The Dashboard app provides a bird's eye view of status of your ClearOS system.
This app is installed by default.
You can find this feature in the top-level menu.
To access the Settings, click on the gear wheel on the top right of the screen.
Here you can select the number of rows (max=8) and the number of columns in each row (max=4).
Having selected the number of widgets you like to appear on this screen in the Settings menu, you will see a number of drop-down boxes like:
Here you choose which widget you'd like to have appear in that position of the main screen.
The only way to remove a widget from the screen is to change the number of columns you which to appear in that row of the Settings screen. It may mean re-doing the whole row.