1. Place the task bar vertically
2. Adjust the task bar width e.g. so that the tray icons appear in rows of three
3. Open some windows a Dolphin window so that there is at least one task open in the task bar
Before: The task buttons show only icons that stretch through the most of the button width. There is no text in the task button
After:
1. Task Manager contect menu > Task Manager Settings... >
Lower the maximum text lines to e.g. 2
Lower the minimum line length to e.g. 1
Hit OK
2. The task buttons are showing a bit smaller icons and there is some text shown there too.