So I realized this first on my main character, but there doesn't seem to be any way to change what battle skills one can use. I have the following classes in the following order. Mistress, Fighter Scholar, Attendant, Archer Dragon Knight, Paladin.  The Dragon Knight class filled my last battle skill slot, so when I picked up Paladin I didn't get any new battle skills only the static stats. Is there anyway to trade out some of the skills I don't use for the paladin skills? Having a locked skill list when you leave the mansion seems perfectly fine, but It seems like a big missed opportunity for cool customization to have skills be purely based on the order you pick up classes.

If you play on a windows pc:

Click on the button left on the skills to switch between combat and social skills.

Too change a skill, just do a right click on the skill and a list with all your skills show up.

P:S: You can have a Skill multiple times in that list, but it is always the same skill and not multiple versions of it

You can also right click in battle to change them.

Ahh thank you both, I don't know how I missed this I felt like I was looking through menus forever and kinda resolved myself to only using the first few learned. This helps a lot.