What's going on with my Excel spreadsheet ? I don't know what caused this large area of cells !

[avokaty]

[#2]

@avokaty 

Collapse the formula bar. 

[#3]

@avokaty Ctrl+Shift+U works

[#4]

@Detlef Lewin    THANK YOU !   

[#5]

@Sergei Baklan    THANK YOU !!!