On the right-hand side of the capture filter is a green toolbar icon called bookmarks, where the built-in capture filters are stored. Any time you create and save a filter, Wireshark will store the filter in the bookmark.

If you click on the green toolbar icon, then you will see a list of capture filters, as shown in the following screenshot:

Once there, you can select one of the filters, and Wireshark will populate the capture filter field.

If you create a filter and want to save it, then drop down the bookmark icon and select Save this filter, and Wireshark will store the filter in the bookmark.

To clear the capture filter, select the X on the right-hand side of the capture filter.

To see your previously used capture filters, go to the right-hand side of the capture filter and select the down arrow to display the list.