In this view, you can easily see the list of all hosts and services.

On the top of the list, fields will allow you to filter this list:
There are 2 kinds of filters:
Text filter (like Host or Check columns).
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List of values (like Priority or Status columns):
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A click on the gearing button
will open the following pop-up.
If you don't make any action, the page will be refreshed every minutes
If you click a button or any element in the interface, a refresh will occur 60 seconds after the last action.
You can force a refresh using this button 
The filter panel can be opened by clicking on the left bar (Overview image : 4). In this menu, you will be able to stack “and/or rules”.
By default, the following filters are defined
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You can select host matching status type.
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You can select host properties
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To add other filters:
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To add a block, click on the "OR" button.

Simply click on Filter button.

In the list, you will see only elements matching the defined filter.