This page of ReSharper options allows you to configure filtering in ReSharper's code completion lists.
This checkbox allows you to enable or disable filters for code completion suggestions.
Show filters bar in completion window
If you clear this checkbox, completion filters stay enabled but the filter bar is not shown under the completion popup. You can still toggle filter using shortcuts, which you can assign to each filter. You can also configure the default state of the filters below on this options page. The custom filters stay enabled as well.
Persist filters state
If this checkbox is selected, ReSharper saves and restores your modifications to completion filters each time you use code completion. The current state of filters is shown in the table below this checkbox. You can use this table to define filter settings that will be applied next time you use code completion.
This section lists custom filters, which you can use to exclude specific symbols, namespaces and/or assemblies from the completion suggestions.