I found this thread. You don’t need to install gnome-tweaks in Zorin 18 to select a cursor theme. You can do this in Zorin appearance > theme.
It sounds as it is depending on the cusor theme you use. You could try it with another cursor theme. I myself have set "Bibata modern ice" as custom cursor theme, and there the cursor has another look when loading an app launcher from desktop so that it is clear that the app is loading.
Just for example. Bibata modern ice is a white cursor, the black variant is called Bibata modern classic.
On my Zorin 17 Lite system the default Adwaita cursor or whiteglass cursor are animated when loading apps.
Edit: Hm, in Zorin 18 Core the same ones are not animated...