In Windows 10, the mouse pointer may occasionally or permanently appear very large. This error is corrected after a restart, but sometimes it reoccurs after a few minutes or hours or remains completely.
In this scenario, third-party software is usually responsible for the malfunction. Nevertheless, you should check this setting of your Windows 10 installation.
Large mouse pointer in Windows 10 - check setting
1. open the Windows 10 settings.
2. select "Ease of use".
3. go to "Cursor & Pointer Size
4. you can now adjust the pointer size by selecting the button with the largest pointer
So now you know the setting for your large mouse pointer and also what you need to check with your operating system.