Hello, thank you for playing the DEMO and sharing the flaws you found during gameplay! Unfortunately, I wasn't able to replicate the issue you described. The game uses the standart mouse pointer of your system and interacting with the UI works perfectly fine and as intended. If you want, you can describe the issues you've found in more detail here or on community discord where you can share a screenshot or a video of the issue.
Sorry I will not use time to try to test more, but I can give you more info since you are looking for it.
I'm on Mac but always play windows versions of AVNs using CrossOver, in order to avoid viruses just in cases some AVNs contain one.
The Unreal inZOI game works ok with CrossOver so I thought Unreal is not the problem...