Thank you for your help and response.
I actually l do have excel on my desktop. I tried opening the project there and am able to type into the cells without a problem. I also saw the orientation button there as you mentioned.
However, I need to have the spreadsheet available online as there are multiple users viewing and updating it.
I also tried your suggestions to click the wrap text button in a cell. That doesn't seem to solve the issue. However, I noticed that if I start typing into the cell then delete the text that is written backwards and vertically 2-3 times by the 3-4 try it will start typing normally horizontally. This leads me to conclude there is some sort of coding error or other malfunctin at play.
I have been using this exact spreadsheet since March and have only yesterday noticed this issue.
Please advise.