Summary

• My Dolphin on KDE Plasma started holding the old window size even though I close it after shrinking the window size.

Solution

1. Open Dolphin.
2. Move Dolphin to another monitor.
3. Resize the window of Dolphin.
4. Close Dolphin.
5. Next time you open Dolphin, the window size should be changed.

Reference

• Dolphin size and position