To add a device to your workspace, click the Device Drawer button on the top left of the toolbar.
This will open the list of available and visible devices to the left.
Drag and drop devices from the Available Devices section on the left to add them to your workspace.
Open the Device Drawer. In the Visible Devices section, click the Eye icon to the extreme right of the device name.
Alternatively, you can remove a device by opening the 3-dot menu on the top-right of the device, and clicking Hide.
Open the Device Drawer, then drag and drop devices within the Visible Devices section to change the order in which they appear.