Step-By-Step Guide:

1. Ensure you are in Edit Mode
   
   
2. Select the grey shaded area of the text box, corresponding to the column/row that you would like to amend
   
   
3. The cell editor window will appear
   
   
4. Select the 'Minimum Width' or 'Minimum Height' Text Box
   
   
5. Type in the amount of pixel spacing that you would like
   For example, 35 pixels is often used for spacer columns, or 150 pixels for column widths
   
   
6. Select Save & Refresh

Video Guide:

Click to see larger size