Use the Filter to temporarily hide from the report some data unnecessary for you at the moment to concentrate on the quantities you are currently working with.
How does the filter work?
To enable the filter, click on the menu button which is placed on the right of any column's header and choose the Filter icon after it. There you will see the list of possible filtering options. They are:
Select All - to switch on/off all the items of your report
Blanks - to switch on/off all the blank cells of your report
The values inserted in your particular report
As soon as you don't need to use the filter anymore, press "Reset Filter" button.