I don't know if this is a Zorin OS issue or Todoist issue, but when my mouse pointer is in the Todoist todo list manager app, my pointer is about 1/10th its normal size and is very difficult to locate on my screen without moving it around.
There is no adjustment within Todoist to correct this. Has anyone else experienced this, and what is the answer?
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You have installed it as Flatpak, didn't You? This could be the Reason. Also, the Flatpak is not an official one. So report or ask for it, isn't an Option. But You could try instead of the Flatpak the offered AppImage from the developer:
I've never used the Todoist app, but I had the issue with Discord and it was because I was using a custom cursor. When I changed it back to Adwaita the issue was resolved. Dunno if it could be a similar thing.