Move WD to below Item in the Rows area. Now in the row direction, countries group first, and within each country, weekdays are listed.
Drag WD above Item in the Rows area. Now weekdays group first, and countries are nested within them.
In this arrangement, each country has a minus (–) button next to it. Click it to collapse that country's weekday detail rows.
Click the plus (+) button to expand the detail again.
Now drag Type into the Filters area at the top. A filter dropdown appears above