There is another place to try besides the page footer, @Abigail3 .
Are you working from a laptop? Click your photo in the top right when you are signed in. Choose Account from the dropdown. Choose Global Preferences. Look to see whether your preferred currency is correct. If not, click Edit and change it.
Did that help?
You can also reach your currency from the initial dropdown when you click your photo. It is further down the list. Try that, too, if changing it in Account doesn't work.