What happens with the menu command Evaluation > Evaluate Notebook? This should evaluate everything in the notebook file.
Evaluation > Evaluate Notebook
No, the cursor is horizontal after I have clicked Shift+Enter.
Before that, It was inside the cell above just next to 2+3
2+3
If the cursor is blinking horizontally it is not in the cell above. It is waiting for new input into the next cell. Click somewhere around 2+3 and hit SHIFT+ENTER
Cursor is inside the cell but still, it is not showing any output. The cursor is blinking horizontally on the line. I am using the web version. I have stable internet connection, everything is loading except this.