Click on the New filter button in the Open entities dialog. The filter box will then appear and an empty filter will be displayed.
Uncompiled or partially compiled filters are displayed with a red background.
Click on the elements of the triplet to set their values through the entity selection popover.
To record a new variable and set it as the value of the element, write its name in the entity selection popover search entry and press the Record new variable button.
To record a new variable ad set as the default (i.e. its elements will be the results) for the query, press the record and set default variable button:
To set an already recorded variable as default, hover its row in the entity selection popover with the mouse and press the select variable button
Remember: queries that do not contain a selected variable won't be executed
To delete a variable, hover its row in the entity selection popover with the mouse and press the delete variable button
To select an item, search for its label in the entity selection popover search entry and click on corresponding item in the results.
To select a property, search for its label in the entity selection popover search entry and click on the corresponding property in the results.
You can filter properties in search results prefixing property: to your query (as in property:child)