Revision history [back]

If you recently did that installation, dnf history might help you. Use dnf history list and dnf history info [some history ID] to find out which history ID your KDE installation had. Then run dnf history undo [some history ID] to undo that transaction. This might undo all package transactions since [some history ID]. See man dnf, section "history". There is also another option, dnf history rollback.

If that is not possible, try dnf remove kf5-\* plasma-\* kde\* sddm\* breeze\* followed by dnf autoremove. This might do the trick, or it might leave some packages, I don't know.

PS: the backslash (\) is used to make bash not interpret (expand) the asterisk (*), so that dnf can expand it.