Do I need to reload Linux Lite again to set partition ?

[rokytnji]

I was going to change them later.

I wouldn't. Ext file system is my preferred file system during a install. Even storage.

Now I'm looking to change size I can only see one drive with partition of 461gb.
I can't resize or unmount at the OS LL is using this drive.

Not sure what you are saying. So just a guess here. You need to use a live session, not a installed session to mess with drives.
That is because gparted does not like messing with internal partitions on the drive you are running.
Like I said. Just guessing that is what you are doing.

Edit: A reinstall is not necessary. Just boot a live session. Do your thing. Then reboot. I would probably do a check of LL installed / partition in gparted
though before a reboot to make sure my changes did not break anything. It (check) is in the right click menu in gparted. You need to unmount the drive being checked before gparted will l;et you use it.