To filter a layer before adding it to the map, double click on its name or use <label>Build query</label> button. This will open the Query Builder, allowing you to build up a SQL statement to use in filtering the records.
<li><label>Also list tables with no geometry</label> Indicates that tables without geometry should also be listed.
<li><label>Keep dialog open</label> Indicated that the dialog should not be closed when tables are added.
<li>Ticking <label>Search options</label> enables additional options for searching in different column types and using 2 search modes: <label>Wildcard</label> or <label>RegExp</label>.