I can't change spells

[MOLLY]

please help me. completed a quest task with Richard Jackdaw. I discovered all the talents. But I still can't change spells in slots. I can change it only through the "T" key. Has anyone had such a problem? how did you decide?

[Psyringe]

Just to be sure: Did you also spend talent points on the talents that give you additional spell bars?

To assign spells to slots, press the respective key to open the spell selection dialog (might be the "T" key, I'm not sure since I redefined my keybindings). Then drag-and-drop spells from the spell list shown to the right into the spell slots shown to the left. You'll always see all 4 spell bars on this screen, but if they aren't active yet (because you haven't yet spent the talent points), they will look greyed out.

To switch between spell bars while fighting or exploring, scroll your mouse wheel.

[PartialDemon]

If you have already purchased the extra spell sets in the core talents menu and set up the extra spell sets in the "T" menu, you may want to check your Setting>Control Options/PC Control options and see which buttons swap spell list.
I use my scroll wheel to swap spell sets, first set is combat: Confringo, Levioso, Descendo, Depulso (Burning rag dolls are so much fun). Second set is sneaky combat: Glacius, Accio, Diffindo, Disillusionment. Third set is puzzle solving, Accio, Levioso, Flipendo, Lumos. Fourth set is for the RoR Nab-Sack,Beast Brush, Conjuring Spell, Evanesco