Hello,
Sorry to hear you are having issues. First, Stardock Software only does technical support via its forum. You're encourage to create account not just for the forum, but also to manage your account like activation etc.
As for your question on taskbar size, below is my screenshot on Windows 11 v23H2 OS Build 22631.3737, with small taskbar on Start11 v2.08

Thank you.
Basj,
Stardock Community Assistant.