I am using Harmony 21 Advanced on Mac OS
when make changes to colors of a pallet in the tint pannel those chaneges do not preview in the pallet and the drawig colors used in when previwe is checked and those changes are not applied when I click apply.
Are you on the latest build 21.0.1.17727 of Harmony 21 (under Help and About)? What macOS version are you on?
In the Tint Panel… you are selecting one or more colours to modify. You can select all your colours by pressing ⌘ + A (macOS).