Quick Question: I hid a few columns, How to I unhide them???

[PhotogTalia]

Hello,

I hid columns D and E and now I want to unhide them. Usually I just drag my mouse over the column until it changes to the double arrow with 2 lines down the middle and it moves to the side but now it only changes to the double arrow with 1 line and doesn´t allow me to show my columns again. Could it be because I saved the excel sheet like this?

[Special-K]

Select the whole sheet by clicking on the square to the left of column A
Now right click any column header and select Unhide

[FDibbins]

or you can just click on the column (C) and "drag" to F, then right-click and select unhide