The icon filters in the appointment list are useful for filtering appointments, increasing the overview and making differentiation easier.
You can find the icon filters in the appointment list near the headers, as shown below:

Step 1:
Open a work order and navigate to the icons (see image below):
Step 2:
Click on the dropdown of the desired icon and select a colour. Click again on the icon with the same colour to remove it.

This icon will now appear in the appointment list, under the icon filters column.
There are different colored shopping carts available, which can be activated in the Account settings. Here are their meanings:
The
dollar sign filters all appointments where the dollar sign is
activated.
Example: If you have assigned the meaning of "customer has paid" to this notification, you can display all appointments/work orders that have not been paid yet.
Once you click on any of the last four icons in the header, the icon turns green, and the appointment list is refreshed to show all appointments that contain the respective icon, which will be displayed in green in the filter.
Example: If you activate the star and pin icons, you will see appointments for VIP customers and appointments with an intervention that has a comment.
If you activate the dollar sign and one or more of the last four icons in green, all appointments with the last four icons will be shown, but without the appointment with the dollar sign.
Example: If you click on the dollar sign,
the pin icon, and the shopping cart, the appointments with a note and the
appointments with a part available will be shown, but only the appointments
that have not been paid yet.