Selecting items in Dropbox with Voiceover

Hello all,

I am using Mac OS Mojave on a MacBook Pro. I have just installed Dropbox but given the amount of disc space, I don't want to sync all my folders. However, when I go into preferences and try to edit which folders I would like to keep, it shows the browser with the list of folders but there are no visible checkboxes to click on, meaning that I seemingly can't manually deselect them. Does anyone know of a workaround or a way to bypass this issue?
Any help Ould be hugely appreciated.