What is Add-in? Switching Add-ins on and off

Add-in is a supplemental program or component that extends the capabilities of QuickField by adding custom features, such as custom menu items, toolbar buttons etc.

To view the list of add-ins available on your computer:

On the Tools menu click Add-in Manager.
You will see the list of available add-ins. To get more information about some add-in, select it in the list. You will see its description in the box below the list.

Add-ins can be switched on and off. You can switch an add-in off if you do not plan to use it for some time. Switching an add-in off does not remove it from your computer; you can switch it on later.

To switch add-ins on or off:

On the Tools menu click Add-in Manager.
To switch an add-in on, select the check box next to its name.
To switch an add-in off, clear the check box next to its name.
Click OK.