Hi William Hicks,
Good Day. I hope everything's fine. Sorry to hear about your mouse cursor issue. Let's try some few fixes, and let's see which will resolve your problem.
First, try to check if this is a Hardware Graphics Acceleration Issue. Let's try to disable this. Open your Excel > File > Options > Advance. Scroll down to Display part. Click the box of "Disable Hardware Graphics Acceleration". click OK > Close Excel > Open again, the check.
Second, disable your "Hide pointer while typing" feature. To do this, press "Win+R" > type main.cpl > Hit enter. Go to Pointer Options tab > Uncheck the box of "Hide Pointer While Typing" > Apply > OK. Then check again.
Third, incase you are using a Laptop or touchscreen, try to disable the Touch/Tablet mode if available. On the top ribbon (of Excel), look for Touch/Mouse Mode icon, this has a hand or pointer symbol. Click it > Choose Mouse Mode. If the icon doesn't show on your ribbon. Right click the ribbon > Custom the Ribbon > add "Touch/Mouse mode" from commands. Then do the process.
Fourth, update or restart your display driver. Right click the Start Button > Click Device Manager > Expand the "Display adpaters" section > Right click your graphics driver > Update Driver. Or instead of clicking the "Update Driver" click "Disable Device" wait for 10 seconds then "Enable" again. Restart Excel and Check.
Fifth, disable any add-ins or settings that might interfering the system. To check if your excel has add-ins, launch it in Safe Mode. To do this, Press Win+R > type "excel /safe" > Hit enter. This will open your excel without add-ins. If the cursor became visible, disable it. Go to File > Options > Add-ins > Then disable it.
As a last resort, try to repair your Microsoft Office. This might correct corrupted excel files or settings. Go to "Control Panel" > Programs > Programs and features > Scroll to Microsoft 365 or Microsoft Office > Click Change > Click Quick Repair. Then check again.
I hope one of the solutions above will solve your cursor issue.
Regards,
Jhun