Hello Tool panel can't be dragged to the Right. On the right side can be dragged individual panels, but not all.
I suggest you to download current 5.0.7 build (32b version) from PSPad developer forum and replace existing files with content of the archive. -- <https://forum.pspad.com/read.php?2,77365,77366> PSPad freeware editor https://www.pspad.com