There is a button on the toolbar for enabling or disabling the filter. If you are using the current version, it is to the left of the drop-down field where you can select filters. Or from the View menu, pick 'Toggle Filter' (or Shift-F6).

The purpose of having a way of immediately disabling the filter is while you are creating the view - it's a great way of testing to make sure the filter is reading the records you mean it to. If you enter a filter and the listed records are not as you anticipated, you can turn the filter off, check which records are (not) appearing, and then modify the filter accordingly.